U.S. patent application number 17/431102 was filed with the patent office on 2022-05-12 for indicating dmrs ports for codewords.
The applicant listed for this patent is LENOVO (BEIJING) LIMITED. Invention is credited to Wei Ling, Bingchao Liu, Lingling Xiao, Chenxi Zhu.
Application Number | 20220150019 17/431102 |
Document ID | / |
Family ID | 1000006153954 |
Filed Date | 2022-05-12 |
United States Patent
Application |
20220150019 |
Kind Code |
A1 |
Xiao; Lingling ; et
al. |
May 12, 2022 |
INDICATING DMRS PORTS FOR CODEWORDS
Abstract
Apparatuses, methods, and systems are disclosed for indicating
DMRS ports for codewords. One method (500) includes transmitting
(502) downlink control information. The downlink control
information includes first information used to indicate a plurality
of demodulation reference signal ports for transmitting a plurality
of codewords, receiving the plurality of codewords, or a
combination thereof. The method (500) includes transmitting (504)
second information indicating a plurality of reference signals for
transmitting the plurality of codewords, receiving the plurality of
codewords, or a combination thereof.
Inventors: |
Xiao; Lingling; (Beijing,
CN) ; Liu; Bingchao; (Beijing, CN) ; Zhu;
Chenxi; (Beijing, CN) ; Ling; Wei; (Beijing,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LENOVO (BEIJING) LIMITED |
Beijing |
|
CN |
|
|
Family ID: |
1000006153954 |
Appl. No.: |
17/431102 |
Filed: |
February 15, 2019 |
PCT Filed: |
February 15, 2019 |
PCT NO: |
PCT/CN2019/075233 |
371 Date: |
August 13, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 72/042 20130101;
H04L 5/0053 20130101; H04L 5/0094 20130101; H04L 5/0051 20130101;
H04B 7/0691 20130101; H04L 5/0016 20130101 |
International
Class: |
H04L 5/00 20060101
H04L005/00; H04W 72/04 20060101 H04W072/04 |
Claims
1. A method comprising: transmitting a demodulation reference
signal group configuration comprising at least one code division
multiplexed group of a plurality of code division multiplexed
groups; transmitting downlink control information, wherein the
downlink control information comprises first information used to
indicate a plurality of demodulation reference signal ports for
transmitting a plurality of codewords based on the demodulation
reference signal group configuration, receiving the plurality of
codewords, or a combination thereof; and transmitting second
information indicating a plurality of reference signals for
transmitting the plurality of codewords, receiving the plurality of
codewords, or a combination thereof.
2. (canceled)
3. (canceled)
4. (canceled)
5. (canceled)
6. (canceled)
7. The method of claim 5, wherein the downlink control information
comprises at least one bit used to indicate whether a third code
division multiplexed group of the plurality of code division
multiplexed groups is assigned to a first demodulation reference
signal group of the plurality of demodulation reference signal
groups, a second demodulation reference signal group of the
plurality of demodulation reference signal groups, no demodulation
reference signal group of the plurality of demodulation reference
signal groups, or some combination thereof.
8. The method of claim 7, wherein a first code division multiplexed
group of the plurality of code division multiplexed groups is
assigned to the first demodulation reference signal group, and a
second code division multiplexed group of the plurality of code
division multiplexed groups is assigned to the second demodulation
reference signal group.
9. The method of claim 4, wherein a demodulation reference signal
group indicated by the demodulation reference signal group
configuration comprises a set of demodulation reference signal
ports of the plurality of demodulation reference signal ports, and
each demodulation reference signal port of the set of demodulation
reference signal ports is quasi co-located with other demodulation
reference signal ports of the set of demodulation reference signal
ports.
10. The method of claim 4, wherein a demodulation reference signal
group indicated by the demodulation reference signal group
configuration corresponds to one transmission reception point of a
plurality of transmission reception points, one panel of a
plurality of panels, or a combination thereof.
11. The method of claim 10, wherein the one panel comprises a panel
identifier and the panel identifier is used as a demodulation
reference signal group identifier.
12. (canceled)
13. (canceled)
14. The method of claim 1, wherein the second information is
indicated by a plurality of sounding reference signal resource
indicators or transmission configuration indicator states.
15. The method of claim 14, wherein each sounding reference signal
resource indicator of the plurality of sounding reference signal
resource indicators comprises at least one reference signal of the
plurality of reference signals, and a target demodulation reference
signal is transmitted with a spatial domain transmission filter
indicated by a corresponding sounding reference signal resource
indicator.
16. The method of claim 14, wherein each transmission configuration
indicator state of the plurality of transmission configuration
indicator states comprises a least one reference signal of the
plurality of reference signals, and the at least one reference
signal is quasi co-located with one demodulation reference signal
group for downlink reception.
17. An apparatus comprising: a transmitter that: transmits a
demodulation reference signal group configuration comprising at
least one code division multiplexed group of a plurality of code
division multiplexed groups; transmits downlink control
information, wherein the downlink control information comprises
first information used to indicate a plurality of demodulation
reference signal ports for transmitting a plurality of codewords
based on the demodulation reference signal group configuration,
receiving the plurality of codewords, or a combination thereof; and
transmits second information indicating a plurality of reference
signals for transmitting the plurality of codewords, receiving the
plurality of codewords, or a combination thereof.
18. (canceled)
19. (canceled)
20. (canceled)
21. (canceled)
22. (canceled)
23. (canceled)
24. (canceled)
25. (canceled)
26. (canceled)
27. (canceled)
28. (canceled)
29. (canceled)
30. (canceled)
31. (canceled)
32. (canceled)
33. A method comprising: receiving a demodulation reference signal
group configuration comprising at least one code division
multiplexed group of a plurality of code division multiplexed
groups; receiving downlink control information, wherein the
downlink control information comprises first information used to
indicate a plurality of demodulation reference signal ports for
transmitting a plurality of codewords based on the demodulation
reference signal group configuration, receiving the plurality of
codewords, or a combination thereof; determining a set of
demodulation reference signal ports of the plurality of
demodulation reference signal ports for each codeword of the
plurality of codewords based on the demodulation reference signal
group configuration; and receiving second information indicating a
plurality of reference signals for transmitting the plurality of
codewords, receiving the plurality of codewords, or a combination
thereof.
34. (canceled)
35. (canceled)
36. (canceled)
37. (canceled)
38. (canceled)
39. The method of claim 37, wherein the downlink control
information comprises at least one bit used to indicate whether a
third code division multiplexed group of the plurality of code
division multiplexed groups is assigned to a first demodulation
reference signal group of the plurality of demodulation reference
signal groups, a second demodulation reference signal group of the
plurality of demodulation reference signal groups, no demodulation
reference signal group of the plurality of demodulation reference
signal groups, or some combination thereof.
40. The method of claim 39, wherein a first code division
multiplexed group of the plurality of code division multiplexed
groups is assigned to the first demodulation reference signal
group, and a second code division multiplexed group of the
plurality of code division multiplexed groups is assigned to the
second demodulation reference signal group.
41. The method of claim 33, wherein a demodulation reference signal
group indicated by the demodulation reference signal group
configuration comprises a set of demodulation reference signal
ports of the plurality of demodulation reference signal ports, and
each demodulation reference signal port of the set of demodulation
reference signal ports is quasi co-located with other demodulation
reference signal ports of the set of demodulation reference signal
ports.
42. The method of claim 33, wherein a demodulation reference signal
group indicated by the demodulation reference signal group
configuration corresponds to one transmission reception point of a
plurality of transmission reception points, one panel of a
plurality of panels, or a combination thereof.
43. The method of claim 42, wherein the one panel comprises a panel
identifier.
44. The method of claim 43, wherein the panel identifier is used as
a demodulation reference signal group identifier.
45. (canceled)
46. The method of claim 33, wherein the second information is
indicated by a plurality of sounding reference signal resource
indicators or transmission configuration indicator states.
47. The method of claim 46, wherein each sounding reference signal
resource indicator of the plurality of sounding reference signal
resource indicators comprises at least one reference signal of the
plurality of reference signals, and a target demodulation reference
signal is transmitted with a spatial domain transmission filter
indicated by a corresponding sounding reference signal resource
indicator.
48. The method of claim 46, wherein each transmission configuration
indicator state of the plurality of transmission configuration
indicator states comprises a least one reference signal of the
plurality of reference signals, and the at least one reference
signal is quasi co-located with one demodulation reference signal
group for downlink reception.
49. (canceled)
50. (canceled)
51. (canceled)
52. (canceled)
53. (canceled)
54. (canceled)
55. (canceled)
56. (canceled)
57. (canceled)
58. (canceled)
59. (canceled)
60. (canceled)
61. (canceled)
62. (canceled)
63. (canceled)
64. (canceled)
Description
FIELD
[0001] The subject matter disclosed herein relates generally to
wireless communications and more particularly relates to indicating
DMRS ports for codewords.
BACKGROUND
[0002] The following abbreviations are herewith defined, at least
some of which are referred to within the following description:
Third Generation Partnership Project ("3GPP"), 5G QoS Indicator
("5QI"), Acknowledge Mode ("AM"), Backhaul ("BH"), Broadcast
Multicast ("BM"), Buffer Occupancy ("BO"), Base Station ("BS"),
Buffer Status Report ("BSR"), Bandwidth ("BW"), Bandwidth Part
("BWP"), Component Carrier ("CC"), Code Division Multiplexing
("CDM"), Control Element ("CE"), Coordinated Multipoint ("CoMP"),
Categories of Requirements ("CoR"), Control Plane ("CP"), CSI-RS
Resource Indicator ("CRI"), Cell RNTI ("C-RNTI"), Channel State
Information ("CSI"), Channel Quality Indicator ("CQI"), Central
Unit ("CU"), Codeword ("CW"), Downlink Control Information ("DCI"),
Downlink ("DL"), Demodulation Reference Signal ("DMRS" or "DM-RS"),
Data Radio Bearer ("DRB"), Dedicated Short-Range Communications
("DSRC"), Distributed Unit ("DU"), Enhanced Mobile Broadband
("eMBB"), Evolved Node B ("eNB"), Enhanced Subscriber
Identification Module ("eSIM"), Enhanced ("E"), Frequency Division
Duplex ("FDD"), Frequency Division Multiple Access ("FDMA"),
Frequency Range ("FR"), 450 MHz-6000 MHz ("FR1"), 24250 MHz-52600
MHz ("FR2"), Hybrid Automatic Repeat Request ("HARQ"), Integrated
Access Backhaul ("IAB"), Identity or Identifier or Identification
("ID"), Interference Measurement ("IM"), International Mobile
Subscriber Identity ("IMSI"), Internet-of-Things ("IoT"), Internet
Protocol ("IP"), Joint Transmission ("JT"), Level 1 ("L1"), Logical
Channel ("LCH"), Logical Channel Group ("LCG"), Logical Channel ID
("LCID"), Logical Channel Prioritization ("LCP"), Long Term
Evolution ("LTE"), Levels of Automation ("LoA"), Medium Access
Control ("MAC"), Modulation Coding Scheme ("MCS"), Multiple Input
Multiple Output ("MIMO"), Mobile-Termination ("MT"), Machine Type
Communication ("MTC"), Multi-User ("MU"), Multi-User MIMO
("MU-MIMO"), Negative-Acknowledgment ("NACK") or ("NAK"), Next
Generation ("NG"), Next Generation Node B ("gNB"), New Radio
("NR"), Non-Zero Power ("NZP"), Orthogonal Frequency Division
Multiplexing ("OFDM"), Peak-to-Average Power Ratio ("PAPR"),
Physical Broadcast Channel ("PBCH"), Physical Downlink Control
Channel ("PDCCH"), Physical Downlink Shared Channel ("PDSCH"),
Policy Control Function ("PCF"), Packet Data Convergence Protocol
("PDCP"), Packet Data Network ("PDN"), Protocol Data Unit ("PDU"),
Public Land Mobile Network ("PLMN"), Precoding Matrix Indicator
("PMI"), ProSe Per Packet Priority ("PPPP"), ProSe Per Packet
Reliability ("PPPR"), Physical Resource Block ("PRB"), Packet
Switched ("PS"), Physical Sidelink Control Channel ("PSCCH"),
Physical Sidelink Shared Channel ("PSSCH"), Phase Tracking RS
("PTRS" or "PT-RS"), Physical Uplink Shared Channel ("PUSCH"),
Quasi Co-Located ("QCL"), Quality of Service ("QoS"), Random Access
Channel ("RACH"), Radio Access Network ("RAN"), Radio Access
Technology ("RAT"), Resource Element ("RE"), Rank Indicator ("RI"),
Radio Link Control ("RLC"), Radio Link Failure ("RLF"), Radio
Network Temporary Identifier ("RNTI"), Resource Pool ("RP"), Radio
Resource Control ("RRC"), Reference Signal ("RS"), Reference Signal
Received Power ("RSRP"), Reference Signal Received Quality
("RSRQ"), Receive ("RX"), Secondary Cell ("SCell"), Sub Carrier
Spacing ("SCS"), Service Data Unit ("SDU"), Subscriber Identity
Module ("SIM"), Signal-to-Interference and Noise Ratio ("SINR"),
Sidelink ("SL"), Sequence Number ("SN"), Scheduling Request ("SR"),
SRS Resource Indicator ("SRI"), Sounding Reference Signal ("SRS"),
Synchronization Signal ("SS"), SS/PBCH Block ("SSB"), Transmission
Control Information ("TCI"), Time Division Duplex ("TDD"),
Temporary Mobile Subscriber Identity ("TMSI"), Transmitted
Precoding Matrix Indicator ("TPMI"), Transmission Reception Point
("TRP"), Transmit ("TX"), User Entity/Equipment (Mobile Terminal)
("UE"), Universal Integrated Circuit Card ("UICC"), Uplink ("UL"),
Unacknowledged Mode ("UM"), Universal Mobile Telecommunications
System ("UMTS"), User Plane ("UP"), Universal Subscriber Identity
Module ("USIM"), Universal Terrestrial Radio Access Network
("UTRAN"), Vehicle to Everything ("V2X"), Voice Over IP ("VoIP"),
Visited Public Land Mobile Network ("VPLMN"), Vehicle RNTI
("V-RNTI"), Worldwide Interoperability for Microwave Access
("WiMAX"), and Zero Power ("ZP"). As used herein, "HARQ-ACK" may
represent collectively the Positive Acknowledge ("ACK") and the
Negative Acknowledge ("NAK"). ACK means that a TB is correctly
received while NAK means a TB is erroneously received.
[0003] In certain wireless communications networks, multiple
codewords may be used. In such networks, a device may not know what
DMRS ports correspond to the multiple codewords.
BRIEF SUMMARY
[0004] Methods for indicating DMRS ports for codewords are
disclosed. Apparatuses and systems also perform the functions of
the apparatus. In one embodiment, the method includes transmitting
downlink control information. In such an embodiment, the downlink
control information includes first information used to indicate a
plurality of demodulation reference signal ports for transmitting a
plurality of codewords, receiving the plurality of codewords, or a
combination thereof. In certain embodiments, the method includes
transmitting second information indicating a plurality of reference
signals for transmitting the plurality of codewords, receiving the
plurality of codewords, or a combination thereof.
[0005] An apparatus for indicating DMRS ports for codewords, in one
embodiment, includes a transmitter that: transmits downlink control
information, wherein the downlink control information comprises
first information used to indicate a plurality of demodulation
reference signal ports for transmitting a plurality of codewords,
receiving the plurality of codewords, or a combination thereof; and
transmits second information indicating a plurality of reference
signals for transmitting the plurality of codewords, receiving the
plurality of codewords, or a combination thereof.
[0006] In one embodiment, a method for receiving information
indicating DMRS ports for codewords includes receiving downlink
control information. In such an embodiment, the downlink control
information includes first information used to indicate a plurality
of demodulation reference signal ports for transmitting a plurality
of codewords, receiving the plurality of codewords, or a
combination thereof. In certain embodiments, the method includes
determining a set of demodulation reference signal ports of the
plurality of demodulation reference signal ports for each codeword
of the plurality of codewords based on a demodulation reference
signal group configuration. In some embodiments, the method
includes receiving second information indicating a plurality of
reference signals for transmitting the plurality of codewords,
receiving the plurality of codewords, or a combination thereof.
[0007] An apparatus for receiving information indicating DMRS ports
for codewords, in one embodiment, includes a receiver that receives
downlink control information. In such an embodiment, the downlink
control information includes first information used to indicate a
plurality of demodulation reference signal ports for transmitting a
plurality of codewords, receiving the plurality of codewords, or a
combination thereof. In certain embodiments, the apparatus includes
a processor that determines a set of demodulation reference signal
ports of the plurality of demodulation reference signal ports for
each codeword of the plurality of codewords based on a demodulation
reference signal group configuration. In some embodiments, the
receiver receives second information indicating a plurality of
reference signals for transmitting the plurality of codewords,
receiving the plurality of codewords, or a combination thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] A more particular description of the embodiments briefly
described above will be rendered by reference to specific
embodiments that are illustrated in the appended drawings.
Understanding that these drawings depict only some embodiments and
are not therefore to be considered to be limiting of scope, the
embodiments will be described and explained with additional
specificity and detail through the use of the accompanying
drawings, in which:
[0009] FIG. 1 is a schematic block diagram illustrating one
embodiment of a wireless communication system for indicating DMRS
ports for codewords;
[0010] FIG. 2 is a schematic block diagram illustrating one
embodiment of an apparatus that may be used for receiving
information indicating DMRS ports for codewords;
[0011] FIG. 3 is a schematic block diagram illustrating one
embodiment of an apparatus that may be used for indicating DMRS
ports for codewords;
[0012] FIG. 4 is a schematic block diagram illustrating one
embodiment of a system for multi TRP communication;
[0013] FIG. 5 is a schematic flow chart diagram illustrating one
embodiment of a method for indicating DMRS ports for codewords;
and
[0014] FIG. 6 is a schematic flow chart diagram illustrating one
embodiment of a method for receiving information indicating DMRS
ports for codewords.
DETAILED DESCRIPTION
[0015] As will be appreciated by one skilled in the art, aspects of
the embodiments may be embodied as a system, apparatus, method, or
program product. Accordingly, embodiments may take the form of an
entirely hardware embodiment, an entirely software embodiment
(including firmware, resident software, micro-code, etc.) or an
embodiment combining software and hardware aspects that may all
generally be referred to herein as a "circuit," "module" or
"system." Furthermore, embodiments may take the form of a program
product embodied in one or more computer readable storage devices
storing machine readable code, computer readable code, and/or
program code, referred hereafter as code. The storage devices may
be tangible, non-transitory, and/or non-transmission. The storage
devices may not embody signals. In a certain embodiment, the
storage devices only employ signals for accessing code.
[0016] Certain of the functional units described in this
specification may be labeled as modules, in order to more
particularly emphasize their implementation independence. For
example, a module may be implemented as a hardware circuit
comprising custom very-large-scale integration ("VLSI") circuits or
gate arrays, off-the-shelf semiconductors such as logic chips,
transistors, or other discrete components. A module may also be
implemented in programmable hardware devices such as field
programmable gate arrays, programmable array logic, programmable
logic devices or the like.
[0017] Modules may also be implemented in code and/or software for
execution by various types of processors. An identified module of
code may, for instance, include one or more physical or logical
blocks of executable code which may, for instance, be organized as
an object, procedure, or function. Nevertheless, the executables of
an identified module need not be physically located together, but
may include disparate instructions stored in different locations
which, when joined logically together, include the module and
achieve the stated purpose for the module.
[0018] Indeed, a module of code may be a single instruction, or
many instructions, and may even be distributed over several
different code segments, among different programs, and across
several memory devices. Similarly, operational data may be
identified and illustrated herein within modules, and may be
embodied in any suitable form and organized within any suitable
type of data structure. The operational data may be collected as a
single data set, or may be distributed over different locations
including over different computer readable storage devices. Where a
module or portions of a module are implemented in software, the
software portions are stored on one or more computer readable
storage devices.
[0019] Any combination of one or more computer readable medium may
be utilized. The computer readable medium may be a computer
readable storage medium. The computer readable storage medium may
be a storage device storing the code. The storage device may be,
for example, but not limited to, an electronic, magnetic, optical,
electromagnetic, infrared, holographic, micromechanical, or
semiconductor system, apparatus, or device, or any suitable
combination of the foregoing.
[0020] More specific examples (a non-exhaustive list) of the
storage device would include the following: an electrical
connection having one or more wires, a portable computer diskette,
a hard disk, a random access memory ("RAM"), a read-only memory
("ROM"), an erasable programmable read-only memory ("EPROM" or
Flash memory), a portable compact disc read-only memory ("CD-ROM"),
an optical storage device, a magnetic storage device, or any
suitable combination of the foregoing. In the context of this
document, a computer readable storage medium may be any tangible
medium that can contain, or store a program for use by or in
connection with an instruction execution system, apparatus, or
device.
[0021] Code for carrying out operations for embodiments may be any
number of lines and may be written in any combination of one or
more programming languages including an object oriented programming
language such as Python, Ruby, Java, Smalltalk, C++, or the like,
and conventional procedural programming languages, such as the "C"
programming language, or the like, and/or machine languages such as
assembly languages. The code may execute entirely on the user's
computer, partly on the user's computer, as a stand-alone software
package, partly on the user's computer and partly on a remote
computer or entirely on the remote computer or server. In the
latter scenario, the remote computer may be connected to the user's
computer through any type of network, including a local area
network ("LAN") or a wide area network ("WAN"), or the connection
may be made to an external computer (for example, through the
Internet using an Internet Service Provider).
[0022] Reference throughout this specification to "one embodiment,"
"an embodiment," or similar language means that a particular
feature, structure, or characteristic described in connection with
the embodiment is included in at least one embodiment. Thus,
appearances of the phrases "in one embodiment," "in an embodiment,"
and similar language throughout this specification may, but do not
necessarily, all refer to the same embodiment, but mean "one or
more but not all embodiments" unless expressly specified otherwise.
The terms "including," "comprising," "having," and variations
thereof mean "including but not limited to," unless expressly
specified otherwise. An enumerated listing of items does not imply
that any or all of the items are mutually exclusive, unless
expressly specified otherwise. The terms "a," "an," and "the" also
refer to "one or more" unless expressly specified otherwise.
[0023] Furthermore, the described features, structures, or
characteristics of the embodiments may be combined in any suitable
manner. In the following description, numerous specific details are
provided, such as examples of programming, software modules, user
selections, network transactions, database queries, database
structures, hardware modules, hardware circuits, hardware chips,
etc., to provide a thorough understanding of embodiments. One
skilled in the relevant art will recognize, however, that
embodiments may be practiced without one or more of the specific
details, or with other methods, components, materials, and so
forth. In other instances, well-known structures, materials, or
operations are not shown or described in detail to avoid obscuring
aspects of an embodiment.
[0024] Aspects of the embodiments are described below with
reference to schematic flowchart diagrams and/or schematic block
diagrams of methods, apparatuses, systems, and program products
according to embodiments. It will be understood that each block of
the schematic flowchart diagrams and/or schematic block diagrams,
and combinations of blocks in the schematic flowchart diagrams
and/or schematic block diagrams, can be implemented by code. The
code may be provided to a processor of a general purpose computer,
special purpose computer, or other programmable data processing
apparatus to produce a machine, such that the instructions, which
execute via the processor of the computer or other programmable
data processing apparatus, create means for implementing the
functions/acts specified in the schematic flowchart diagrams and/or
schematic block diagrams block or blocks.
[0025] The code may also be stored in a storage device that can
direct a computer, other programmable data processing apparatus, or
other devices to function in a particular manner, such that the
instructions stored in the storage device produce an article of
manufacture including instructions which implement the function/act
specified in the schematic flowchart diagrams and/or schematic
block diagrams block or blocks.
[0026] The code may also be loaded onto a computer, other
programmable data processing apparatus, or other devices to cause a
series of operational steps to be performed on the computer, other
programmable apparatus or other devices to produce a computer
implemented process such that the code which execute on the
computer or other programmable apparatus provide processes for
implementing the functions/acts specified in the flowchart and/or
block diagram block or blocks.
[0027] The schematic flowchart diagrams and/or schematic block
diagrams in the Figures illustrate the architecture, functionality,
and operation of possible implementations of apparatuses, systems,
methods and program products according to various embodiments. In
this regard, each block in the schematic flowchart diagrams and/or
schematic block diagrams may represent a module, segment, or
portion of code, which includes one or more executable instructions
of the code for implementing the specified logical function(s).
[0028] It should also be noted that, in some alternative
implementations, the functions noted in the block may occur out of
the order noted in the Figures. For example, two blocks shown in
succession may, in fact, be executed substantially concurrently, or
the blocks may sometimes be executed in the reverse order,
depending upon the functionality involved. Other steps and methods
may be conceived that are equivalent in function, logic, or effect
to one or more blocks, or portions thereof, of the illustrated
Figures.
[0029] Although various arrow types and line types may be employed
in the flowchart and/or block diagrams, they are understood not to
limit the scope of the corresponding embodiments. Indeed, some
arrows or other connectors may be used to indicate only the logical
flow of the depicted embodiment. For instance, an arrow may
indicate a waiting or monitoring period of unspecified duration
between enumerated steps of the depicted embodiment. It will also
be noted that each block of the block diagrams and/or flowchart
diagrams, and combinations of blocks in the block diagrams and/or
flowchart diagrams, can be implemented by special purpose
hardware-based systems that perform the specified functions or
acts, or combinations of special purpose hardware and code.
[0030] The description of elements in each figure may refer to
elements of proceeding figures. Like numbers refer to like elements
in all figures, including alternate embodiments of like
elements.
[0031] FIG. 1 depicts an embodiment of a wireless communication
system 100 for indicating DMRS ports for codewords. In one
embodiment, the wireless communication system 100 includes remote
units 102 and network units 104. Even though a specific number of
remote units 102 and network units 104 are depicted in FIG. 1, one
of skill in the art will recognize that any number of remote units
102 and network units 104 may be included in the wireless
communication system 100.
[0032] In one embodiment, the remote units 102 may include
computing devices, such as desktop computers, laptop computers,
personal digital assistants ("PDAs"), tablet computers, smart
phones, smart televisions (e.g., televisions connected to the
Internet), set-top boxes, game consoles, security systems
(including security cameras), vehicle on-board computers, network
devices (e.g., routers, switches, modems), IoT devices, or the
like. In some embodiments, the remote units 102 include wearable
devices, such as smart watches, fitness bands, optical head-mounted
displays, or the like. Moreover, the remote units 102 may be
referred to as subscriber units, mobiles, mobile stations, users,
terminals, mobile terminals, fixed terminals, subscriber stations,
UE, user terminals, a device, or by other terminology used in the
art. The remote units 102 may communicate directly with one or more
of the network units 104 via UL communication signals and/or the
remote units 102 may communicate directly with other remote units
102 via sidelink communication.
[0033] The network units 104 may be distributed over a geographic
region. In certain embodiments, a network unit 104 may also be
referred to as an access point, an access terminal, a base, a base
station, a Node-B, an eNB, a gNB, a Home Node-B, a RAN, a relay
node, a device, a network device, an IAB node, a donor IAB node, or
by any other terminology used in the art. The network units 104 are
generally part of a radio access network that includes one or more
controllers communicably coupled to one or more corresponding
network units 104. The radio access network is generally
communicably coupled to one or more core networks, which may be
coupled to other networks, like the Internet and public switched
telephone networks, among other networks. These and other elements
of radio access and core networks are not illustrated but are well
known generally by those having ordinary skill in the art.
[0034] In one implementation, the wireless communication system 100
is compliant with the 5G or NG (Next Generation) standard of the
3GPP protocol, wherein the network unit 104 transmits using NG RAN
technology. More generally, however, the wireless communication
system 100 may implement some other open or proprietary
communication protocol, for example, WiMAX, among other protocols.
The present disclosure is not intended to be limited to the
implementation of any particular wireless communication system
architecture or protocol.
[0035] The network units 104 may serve a number of remote units 102
within a serving area, for example, a cell or a cell sector via a
wireless communication link. The network units 104 transmit DL
communication signals to serve the remote units 102 in the time,
frequency, and/or spatial domain.
[0036] In various embodiments, a network unit 104 may transmit
downlink control information. In such an embodiment, the downlink
control information includes first information used to indicate a
plurality of demodulation reference signal ports for transmitting a
plurality of codewords, receiving the plurality of codewords, or a
combination thereof. In certain embodiments, the network unit 104
may transmit second information indicating a plurality of reference
signals for transmitting the plurality of codewords, receiving the
plurality of codewords, or a combination thereof. Accordingly, a
network unit 104 may be used for indicating DMRS ports for
codewords.
[0037] In various embodiments, a remote unit 102 may receive
downlink control information. In such embodiments, the downlink
control information includes first information used to indicate a
plurality of demodulation reference signal ports for transmitting a
plurality of codewords, receiving the plurality of codewords, or a
combination thereof. In certain embodiments, the remote unit 102
may determine a set of demodulation reference signal ports of the
plurality of demodulation reference signal ports for each codeword
of the plurality of codewords based on a demodulation reference
signal group configuration. In some embodiments, the remote unit
102 may receive second information indicating a plurality of
reference signals for transmitting the plurality of codewords,
receiving the plurality of codewords, or a combination thereof.
Accordingly, a remote unit 102 may be used for receiving
information indicating DMRS ports for codewords.
[0038] FIG. 2 depicts one embodiment of an apparatus 200 that may
be used for receiving information indicating DMRS ports for
codewords. The apparatus 200 includes one embodiment of the remote
unit 102. Furthermore, the remote unit 102 may include a processor
202, a memory 204, an input device 206, a display 208, a
transmitter 210, and a receiver 212. In some embodiments, the input
device 206 and the display 208 are combined into a single device,
such as a touchscreen. In certain embodiments, the remote unit 102
may not include any input device 206 and/or display 208. In various
embodiments, the remote unit 102 may include one or more of the
processor 202, the memory 204, the transmitter 210, and the
receiver 212, and may not include the input device 206 and/or the
display 208.
[0039] The processor 202, in one embodiment, may include any known
controller capable of executing computer-readable instructions
and/or capable of performing logical operations. For example, the
processor 202 may be a microcontroller, a microprocessor, a central
processing unit ("CPU"), a graphics processing unit ("GPU"), an
auxiliary processing unit, a field programmable gate array
("FPGA"), or similar programmable controller. In some embodiments,
the processor 202 executes instructions stored in the memory 204 to
perform the methods and routines described herein. In some
embodiments, the processor 202 may determine a set of demodulation
reference signal ports of a plurality of demodulation reference
signal ports for each codeword of the plurality of codewords based
on a demodulation reference signal group configuration. The
processor 202 is communicatively coupled to the memory 204, the
input device 206, the display 208, the transmitter 210, and the
receiver 212.
[0040] The memory 204, in one embodiment, is a computer readable
storage medium. In some embodiments, the memory 204 includes
volatile computer storage media. For example, the memory 204 may
include a RAM, including dynamic RAM ("DRAM"), synchronous dynamic
RAM ("SDRAM"), and/or static RAM ("SRAM"). In some embodiments, the
memory 204 includes non-volatile computer storage media. For
example, the memory 204 may include a hard disk drive, a flash
memory, or any other suitable non-volatile computer storage device.
In some embodiments, the memory 204 includes both volatile and
non-volatile computer storage media. In some embodiments, the
memory 204 also stores program code and related data, such as an
operating system or other controller algorithms operating on the
remote unit 102.
[0041] The input device 206, in one embodiment, may include any
known computer input device including a touch panel, a button, a
keyboard, a stylus, a microphone, or the like. In some embodiments,
the input device 206 may be integrated with the display 208, for
example, as a touchscreen or similar touch-sensitive display. In
some embodiments, the input device 206 includes a touchscreen such
that text may be input using a virtual keyboard displayed on the
touchscreen and/or by handwriting on the touchscreen. In some
embodiments, the input device 206 includes two or more different
devices, such as a keyboard and a touch panel.
[0042] The display 208, in one embodiment, may include any known
electronically controllable display or display device. The display
208 may be designed to output visual, audible, and/or haptic
signals. In some embodiments, the display 208 includes an
electronic display capable of outputting visual data to a user. For
example, the display 208 may include, but is not limited to, an LCD
display, an LED display, an OLED display, a projector, or similar
display device capable of outputting images, text, or the like to a
user. As another, non-limiting, example, the display 208 may
include a wearable display such as a smart watch, smart glasses, a
heads-up display, or the like. Further, the display 208 may be a
component of a smart phone, a personal digital assistant, a
television, a table computer, a notebook (laptop) computer, a
personal computer, a vehicle dashboard, or the like.
[0043] In certain embodiments, the display 208 includes one or more
speakers for producing sound. For example, the display 208 may
produce an audible alert or notification (e.g., a beep or chime).
In some embodiments, the display 208 includes one or more haptic
devices for producing vibrations, motion, or other haptic feedback.
In some embodiments, all or portions of the display 208 may be
integrated with the input device 206. For example, the input device
206 and display 208 may form a touchscreen or similar
touch-sensitive display. In other embodiments, the display 208 may
be located near the input device 206.
[0044] The transmitter 210 is used to provide UL communication
signals to the network unit 104 and the receiver 212 is used to
receive DL communication signals from the network unit 104. In one
embodiment, the receiver 212: receives downlink control
information, wherein the downlink control information includes
first information used to indicate a plurality of demodulation
reference signal ports for transmitting a plurality of codewords,
receiving the plurality of codewords, or a combination thereof; and
receives second information indicating a plurality of reference
signals for transmitting the plurality of codewords, receiving the
plurality of codewords, or a combination thereof.
[0045] Although only one transmitter 210 and one receiver 212 are
illustrated, the remote unit 102 may have any suitable number of
transmitters 210 and receivers 212. The transmitter 210 and the
receiver 212 may be any suitable type of transmitters and
receivers. In one embodiment, the transmitter 210 and the receiver
212 may be part of a transceiver.
[0046] FIG. 3 depicts one embodiment of an apparatus 300 that may
be used for indicating DMRS ports for codewords. The apparatus 300
includes one embodiment of the network unit 104. Furthermore, the
network unit 104 may include a processor 302, a memory 304, an
input device 306, a display 308, a transmitter 310, and a receiver
312. As may be appreciated, the processor 302, the memory 304, the
input device 306, the display 308, the transmitter 310, and the
receiver 312 may be substantially similar to the processor 202, the
memory 204, the input device 206, the display 208, the transmitter
210, and the receiver 212 of the remote unit 102, respectively.
[0047] In various embodiments, the transmitter 310: transmits
downlink control information, wherein the downlink control
information comprises first information used to indicate a
plurality of demodulation reference signal ports for transmitting a
plurality of codewords, receiving the plurality of codewords, or a
combination thereof; and transmits second information indicating a
plurality of reference signals for transmitting the plurality of
codewords, receiving the plurality of codewords, or a combination
thereof. Although only one transmitter 310 and one receiver 312 are
illustrated, the network unit 104 may have any suitable number of
transmitters 310 and receivers 312. The transmitter 310 and the
receiver 312 may be any suitable type of transmitters and
receivers. In one embodiment, the transmitter 310 and the receiver
312 may be part of a transceiver.
[0048] In various embodiments, a UE (e.g., a remote unit 102) may
not know which DMRS ports to use for multi-TRP (e.g., from multiple
network units 104) and/or multi-panel transmissions (e.g., from one
network unit 104) for receiving PDSCH and/or the UE may not know
which DMRS ports to use for transmitting PUSCH for multiple TRPs
and/or multiple panels.
[0049] FIG. 4 is a schematic block diagram illustrating one
embodiment of a system 400 for multi TRP communication. The system
400 includes a first TRP 402 and a second TRP 404 that make
concurrent (e.g., simultaneous, overlapping) transmissions to a UE
406 (e.g., having one or more panels). In one embodiment, the
system 400 may include multiple PDCCHs that schedule multiple
PDSCHs and/or PUSCHs from the first TRP 402 and the second TRP 404.
In such an embodiment, communications between the first TRP 402 and
the UE 406 may include communications 408, such as PDCCH (e.g.,
PDCCH0), PDSCH (e.g., PDSCH0), and PUSCH (e.g., PUSCH0), and
communications between the second TRP 404 and the UE 406 may
include communications 410, such as PDCCH (e.g., PDCCH1), PDSCH
(e.g., PDSCH1), and PUSCH (e.g., PUSCH1).
[0050] In another embodiment, the system 400 may include only a
single PDCCH (e.g., transmitted from only one of the
TRPs--transmitted either from the first TRP 402 or from the second
TRP 404) that is used to schedule one PDSCH (e.g., for carrying a
codeword for each TRP) and/or one PUSCH (e.g., for carrying a
codeword for each TRP) corresponding to both of the first TRP 402
and the second TRP 404. In such an embodiment, communications
between the first TRP 402 and the UE 406 may include communications
408, such as PDCCH (e.g., PDCCH0 that includes information that
indicates DMRS ports for carrying CW0 and CW1), PDSCH (e.g., for
carrying CW0 from the first TRP 402 to the UE 406), and PUSCH
(e.g., for carrying CW0 from the UE 406 to the first TRP 402), and
communications between the second TRP 404 and the UE 406 may
include communications 410, such as PDSCH (e.g., for carrying CW1
from the second TRP 404 to the UE 406), and PUSCH (e.g., for
carrying CW1 from the UE 406 to the second TRP 404).
[0051] In certain embodiments, such as to support multi-TRP and/or
multi-panel communications in the system 400, two codewords with up
to eight layers and enhanced layer mapping may be used. In some
embodiments, precoding information (e.g., TPMI) of both codewords
is indicated in an UL grant and a number of layers of each CW
(e.g., represented by N.sub.cw1 and N.sub.cw2) may be derived from
the precoding information. In some embodiments, two or more RSs may
be indicated by TCI states in DCI or SRI in an UL grant to be used
for carrying the CWs. In such embodiments, each RS may correspond
to QCL DMRS ports used for carrying one codeword in a higher
frequency band (e.g., FR2, not FR1).
[0052] Embodiments that use a single PDCCH transmitted from the
first TRP 402 to schedule one PUSCH with two codewords transmitted
from one panel of the UE 406 (e.g., for ideal backhaul only) may be
performed in a variety of ways as described herein. Moreover,
embodiments that use a single PDCCH transmitted from the first TRP
402 to schedule PDSCH transmission from the first TRP 402 and the
second TRP 404 may be performed to indicate DMRS ports for both
TRPs as described herein.
[0053] Tables 1 through 62 are found herein. Each of the tables may
correspond to a plurality of antenna ports and may be for a certain
DMRS CDM group configuration with parameters such as DMRS type and
maximum length of front-load DMRS. In some of the tables, a DMRS
ports index (e.g., table header "DMRS port(s)") indicated in an
entry of such tables may be ordered by N.sub.cw1 ports
corresponding to a first codeword (e.g., CW0) transmitted from a
first panel followed by N.sub.cw2 ports corresponding to a second
codeword (e.g., CW1) transmitted from a second panel. For example,
referencing Table 5 row starting with "Value"=2, the column "DMRS
port(s)"=0; 2, 3 and the column "N.sub.cw1, N.sub.cw2"=1, 2. This
means that the number of layers for CW0=1 and the number of layers
for CW1=2, and the DMRS ports corresponding to the number of layers
are listed for CW0 followed by CW1 (e.g., separated by a ";"), thus
DMRS port 0 corresponds to CW0 and DMRS ports 2 and 3 correspond to
CW1. In some embodiments, the UE 406 may get spatial relation
information for each DMRS port based on a number of layers of each
codeword indicated in an UL grant without knowledge of a specific
CDM group configuration for a panel. In such embodiments, the UE
406 may transmit CW0 with the first N.sub.cw1 DMRS ports of the
indication with the same beam used by the first panel to transmit
SRS resources and may transmit CW1 with the last N.sub.cw2 DMRS
ports with the same beam used by the second panel to transmit SRS
resources, where k.sub.cwi is a number of layers of an i.sup.th
codeword indicated in the UL grant.
[0054] In certain embodiments, there may be two CDM groups for DMRS
type 1 and three CDM groups for DMRS type 2. For DMRS type 1, each
panel may be configured with one CDM group. In various embodiments,
a difference between different CDM groups is an offset of one RB in
a frequency domain. In some embodiments, DMRS ports in a first CDM
group are used for first panel transmission and DMRS ports in a
second CDM group are used for second panel transmission. For DMRS
type 2, a panel may be configured with one or two CDM groups. In
certain embodiments, DMRS ports in a first CDM group are used for
first panel transmission, DMRS ports in a second CDM group are used
for second panel transmission, and DMRS ports in the third CDM
group may be used for first panel transmission, second panel
transmission, and/or no panel transmission. The configuration for
the DMRS ports in the third CDM group may be dynamically,
persistently, and/or semi-persistently configured (e.g.,
preconfigured, predetermined, indicated, signaled, etc.).
[0055] In one example, there may be two codewords for a PUSCH, and
each codeword may be transmitted from one panel. In this example,
the DMRS configuration for the PUSCH transmission is type 1, and
the maximum length of the front-load DMRS is two. Accordingly,
there may be two CDM groups and each CDM group may have up to four
ports. Moreover, DMRS port indexes in a first CDM group may be
ports 0/1/4/5 and DMRS port indexes in a second CDM group may be
ports 2/3/6/7. Furthermore, DMRS ports in the first CDM group are
used for first panel transmission and DMRS ports in the second CDM
group are used for second panel transmission. If a number of layers
for the two codewords are three and one respectively, then a gNB
(e.g., the first TRP 402) may transmit information to the UE 406 to
indicate Value=4 in Table 6. Thus, based on Table 6, the UE 406 may
transmit the first three DMRS ports (e.g., ports 0/1/4) with the
same beam as the transmission of SRS resources from the first panel
and may transmit the last DMRS port (e.g., port 7) with the same
beam as the transmission of SRS resources from the second
panel.
[0056] In another example, there may be two codewords for a PUSCH,
and each codeword may be transmitted from one panel. In this
example, the DMRS configuration for the PUSCH transmission is type
2, and the maximum length of the front-load DMRS is two.
Accordingly, there may be three CDM groups and each CDM group may
have up to four ports. Moreover, DMRS port indexes in a first CDM
group may be ports 0/1/6/7, DMRS port indexes in a second CDM group
may be ports 2/3/8/9, and DMRS port indexes in a third CDM group
may be ports 4/5/10/11. In this example, a number of layers for the
two codewords is three for the first codeword and one for the
second codeword. If the third CDM group is configured for first
panel transmission, then a gNB (e.g., the first TRP 402) may
indicate information to the UE 406 to indicate one value among
values {3, 9, 13, 21} in Table 18. In this example, the gNB may
transmit information to the UE 406 to indicate Value 3 in Table 18
in an UL grant. Thus, based on Table 18, the UE 406 may transmit
the first three DMRS ports (e.g., ports 0/1/4) with the same beam
as the transmission of SRS resources from the first panel and may
transmit the last DMRS port (e.g., port 2) with the same beam as
the transmission of SRS resources from the second panel.
[0057] Table 1 through Table 22 as found herein are designed for
DMRS ports indication for UL transmission. Remaining DMRS ports in
a CDM group in each entry of each table that are not assigned may
be indicated to a UE for single panel transmission use. A dmrs-Type
corresponding to the tables may be one or two and may be configured
by higher layers, a maxLength may be a maximum length of front-load
DMRS symbols, and a rank is a total number of layers for both
codewords. In some embodiments, the maxLength and the rank may be
indicated to the UE 406 by a gNB (e.g., the first TRP 402).
[0058] Table 1 through Table 3 correspond to DMRS port indication
for DMRS type 1 with a maximum length of front-load DMRS being one
symbol. Moreover, Table 1 is for a total of two DMRS ports for both
codewords with a single port for each codeword. Furthermore, for
Table 1 there are four ports that may support up to two
co-scheduled UEs with multi-panel transmission. In some
embodiments, the DMRS ports of co-scheduled UEs must be orthogonal.
For example, if the DMRS ports of a first UE are ports 0 and 2,
then the DMRS ports of a second UE will be ports 1 and 3.
Accordingly, if a first UE with multiple panels is indicated to use
Value 0 in Table 1, then the remaining ports 1 or 3 may be
indicated to a second UE with a single panel (e.g., a first panel
or a second panel). The DMRS group configuration for Table 1 is:
transform precoder is disabled; dmrs-Type=1; maxLength=1; and
rank=2.
TABLE-US-00001 TABLE 1 Number of DMRS CDM group(s) DMRS N.sub.cw1,
Value without data port(s) N.sub.cw2 0 2 0; 2 1, 1 1 2 1; 3 1, 1
2-7 Reserved Reserved Reserved
[0059] Table 2 and Table 3 correspond to DMRS port indication for
three and four DMRS ports split between two codewords. The
configurations of Table 2 cannot support MU configurations because
they each use at least three ports. Specifically, Value 0 and Value
1 in Table 2 are for (N.sub.cw1, N.sub.cw2)=(1, 2) and (N.sub.cw1,
N.sub.cw2)=(2, 1), respectively. The remaining DMRS port in a CDM
group may be scheduled for a UE for single panel transmission use.
For example, if the UE 406 (e.g., that uses multi-panel
transmission) is indicated Value 0 in Table 2, the remaining port 1
in a first CDM group may be indicated to another UE for single
panel transmissions. Table 3 is for four DMRS ports corresponding
to two codewords, with two ports assigned to each codeword. The
DMRS group configuration for Table 2 is: transform precoder is
disabled; dmrs-Type=1; maxLength=1; and rank=3. The DMRS group
configuration for Table 3 is: transform precoder is disabled;
dmrs-Type=1; maxLength=1; and rank=4.
TABLE-US-00002 TABLE 2 Number of DMRS CDM group(s) DMRS N.sub.cw1,
Value without data port(s) N.sub.cw2 0 2 0; 2, 3 1, 2 1 2 0, 1; 2
2, 1 2-7 Reserved Reserved Reserved
TABLE-US-00003 TABLE 3 Number of DMRS CDM group(s) DMRS N.sub.cw1,
Value without data port(s) N.sub.cw2 0 2 0, 1; 2, 3 2, 2 1-7
Reserved Reserved Reserved
[0060] Table 4 through Table 10 correspond to DMRS port indication
for DMRS type 1 with a maximum length of front-load DMRS being two
symbols. Specifically, Table 4 is for a total of two DMRS ports for
both codewords with a single port for each codeword. Furthermore,
the first two entries in Table 4 are for one symbol front-load DMRS
which duplicate information found in Table 1. Moreover, the
remaining entries are for two symbol front-load DMRS. As may be
appreciated, two symbol front-load DMRS may contain up to eight
ports that may support up to four co-scheduled UEs with multi-panel
transmission. In some embodiments, the DMRS ports of co-scheduled
UEs must be orthogonal such that different entries from Table 4 may
be indicated to different UEs. The DMRS group configuration for
Table 4 is: transform precoder is disabled; dmrs-Type=1;
maxLength=2; and rank=2.
TABLE-US-00004 TABLE 4 Number of Number DMRS CDM of front- group(s)
DMRS load N.sub.cw1, Value without data port(s) symbols N.sub.cw2 0
2 0; 2 1 1, 1 1 2 1; 3 1 1, 1 2 2 0; 2 2 1, 1 3 2 1; 3 2 1, 1 4 2
4; 6 2 1, 1 5 2 5; 7 2 1, 1 6-15 Reserved Reserved Reserved
Reserved
[0061] Table 5 is for a total of three DMRS ports for both
codewords. Furthermore, the first two entries in Table 5 are for
one symbol front-load DMRS which duplicate information found in
Table 2. Moreover, the remaining entries are for two symbol
front-load DMRS that may support up to two co-scheduled UEs with
multi-panel transmission. Specifically, Values 2 and 4 in Table 5
are for (N.sub.cw1, N.sub.cw2)=(1, 2) and Value 3 and 5 are for
(N.sub.cw1, N.sub.cw2)=(2, 1). In one embodiment, if the number of
DMRS ports of a UE for CW0 is one and for CW1 two, then a gNB may
indicate one value from Values {2, 4} in Table 5 to the UE. If
there are co-scheduled UEs, a gNB must indicate different entries
to different UEs such that the DMRS ports do not overlap between
the UEs. The DMRS group configuration for Table 5 is: transform
precoder is disabled; dmrs-Type=1; maxLength=2; and rank=3.
TABLE-US-00005 TABLE 5 Number of Number DMRS CDM of front- group(s)
DMRS load N.sub.cw1, Value without data port(s) symbols N.sub.cw2 0
2 0; 2, 3 1 1, 2 1 2 0, 1; 2 1 2, 1 2 2 0; 2, 3 2 1, 2 3 2 0, 1; 2
2 2, 1 4 2 5; 6, 7 2 1, 2 5 2 4, 5; 7 2 2, 1 6-15 Reserved Reserved
Reserved Reserved
[0062] Table 6 is for a total of four DMRS ports for both
codewords. Furthermore, the first entry in Table 6 is for one
symbol front-load DMRS which duplicates information found in Table
3. Moreover, the remaining entries are for two symbol front-load
DMRS. Specifically, Values 1 and 2 in Table 6 are for (N.sub.cw1,
N.sub.cw2)=(2, 2) which may support up to two co-scheduled UEs with
multi-panel transmission and each scheduled UE has two DMRS ports
for each codeword. Value 3 in Table 6 is for (N.sub.cw1,
N.sub.cw2)=(1, 3) and Value 4 is for (N.sub.cw1, N.sub.cw2)=(3, 1).
Values 3 and 4 may be used for DMRS port indication for two
scheduled UEs in which (N.sub.cw1, N.sub.cw2) of a first UE is (1,
3) and (N.sub.cw1, N.sub.cw2) of a second UE is (3, 1). The DMRS
group configuration for Table 6 is: transform precoder is disabled;
dmrs-Type=1; maxLength=2; and rank=4.
TABLE-US-00006 TABLE 6 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols N.sub.cw1, N.sub.cw2
0 2 0, 1; 2, 3 1 2, 2 1 2 0, 1; 2, 3 2 2, 2 2 2 4, 5; 6, 7 2 2, 2 3
2 5; 2, 3, 6 2 1, 3 4 2 0, 1, 4; 7 2 3, 1 5-15 Reserved Reserved
Reserved Reserved
[0063] Table 7 through Table 10 correspond to DMRS port indication
for five to eight DMRS ports for both codewords, respectively. For
these tables, there are eight ports, but not all of these ports may
be used. However, MU configurations may not be supported for
configurations with more than four ports assigned to a UE, so MU
configurations may not be supported with Tables 7 through 10.
Moreover, Tables 7 through 10 don't contain one symbol front-load
DMRS because one symbol front-load DMRS can only support up to four
DMRS port transmission. Values 0 to 3 in Table 7 are for DMRS
indication to a UE for (N.sub.cw1, N.sub.cw2)=(1, 4), (N.sub.cw1,
N.sub.cw2)=(2, 3), (N.sub.cw1, N.sub.cw2)=(3, 2), and (N.sub.cw1,
N.sub.cw2)=(4, 1), respectively. Values 0 to 2 in Table 8 are for
DMRS indication to a UE for (N.sub.cw1, N.sub.cw2)=(2, 4),
(N.sub.cw1, N.sub.cw2)=(3, 3), and (N.sub.cw1, N.sub.cw2)=(4, 2),
respectively. Values 0 and 1 in Table 9 are for (N.sub.cw1,
N.sub.cw2)=(3, 4) and (N.sub.cw1, N.sub.cw2)=(4, 3), respectively.
Table 10 is for a total of eight DMRS ports for both codewords with
four ports for each codeword. The DMRS group configuration for
Table 7 is: transform precoder is disabled; dmrs-Type=1;
maxLength=2; and rank=5.
TABLE-US-00007 TABLE 7 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols N.sub.cw1, N.sub.cw2
0 2 5; 2, 3, 6, 7 2 1, 4 1 2 0, 1; 2, 3, 6 2 2, 3 2 2 0, 1, 4; 2, 3
2 3, 2 3 2 0, 1, 4, 5; 7 2 4, 1 4-15 Reserved Reserved Reserved
Reserved
[0064] The DMRS group configuration for Table 8 is: transform
precoder is disabled; dmrs-Type=1; maxLength=2; and rank=6.
TABLE-US-00008 TABLE 8 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols N.sub.cw1, N.sub.cw2
0 2 0, 1; 2, 3, 6, 7 2 2, 4 1 2 0, 1, 4; 2, 3, 6 2 3, 3 2 2 0, 1,
4, 5; 2, 3 2 4, 2 3-15 Reserved Reserved Reserved Reserved
[0065] The DMRS group configuration for Table 9 is: transform
precoder is disabled; dmrs-Type=1; maxLength=2; and rank=7.
TABLE-US-00009 TABLE 9 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols N.sub.cw1, N.sub.cw2
0 2 0, 1, 4; 2, 3, 6, 7 2 3, 4 1 2 0, 1, 4, 5; 2, 3, 6 2 4, 3 2-15
Reserved Reserved Reserved Reserved
[0066] The DMRS group configuration for Table 10 is: transform
precoder is disabled; dmrs-Type=1; maxLength=2; and rank=8.
TABLE-US-00010 TABLE 10 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols N.sub.cw1, N.sub.cw2
0 2 0, 1, 4, 5; 2 4, 4 2, 3, 6, 7 1-15 Reserved Reserved Reserved
Reserved
[0067] Table 11 through Table 15 correspond to DMRS port indication
for DMRS type 2 with a maximum length of front-load DMRS being one
symbol. Specifically, Table 11 is for a total of two DMRS ports for
both codewords with a single port for each codeword. Moreover,
there are a total of four ports for two CDM groups and six ports
for three CDM groups. The configurations of Table 11 may support up
to two co-scheduled UEs with multi-panel transmission. Furthermore,
the first two entries in Table 11 are for two CDM groups which
duplicate information found in Table 1. Values 2, 3, 4, and 5 in
Table 11 are for configurations in which CDM group 2 is configured
for a first panel. Moreover, Values {2, 3} and {4, 5} in Table 11
are two paired options for DMRS indication for two scheduled UEs
with multi-panel transmission. In one example of such a paired
option, if a first UE is indicated Value 2 in Table 11, a second UE
must be indicated Value 3. The two paired options are different
because different DMRS ports are used which may provide more
flexibility to a gNB. Values 2, 3, 6, and 7 in Table 11 are for
configurations in which CDM group 2 is configured for a second
panel. Values {2, 3} and {6, 7} in Table 11 are two paired options
for DMRS indication for two scheduled UEs with multi-panel
transmission. As may be appreciated, DMRS ports not used may be
indicated to a UE configured for single panel transmission. The
DMRS group configuration for Table 11 is: transform precoder is
disabled; dmrs-Type=2; maxLength=1; and rank=2.
TABLE-US-00011 TABLE 11 Number of DMRS CDM DMRS Value group(s)
without data port(s) N.sub.cw1, N.sub.cw2 0 2 0; 2 1, 1 1 2 1; 3 1,
1 2 3 0; 2 1, 1 3 3 1; 3 1, 1 4 3 4; 2 1, 1 5 3 5; 3 1, 1 6 3 0; 4
1, 1 7 3 1; 5 1, 1 8-15 Reserved Reserved Reserved
[0068] Table 12 is for a total of three DMRS ports for both
codewords. Table 12 illustrates some DMRS ports outside of brackets
which means a third CDM group is configured for a first panel, and
some DMRS ports inside brackets which means the third CDM group is
configured for a second panel. The configurations of Table 12 may
support up to two co-scheduled UEs for multi-panel transmission.
Moreover, the first two entries in Table 12 are for two CDM groups
which duplicate information found in Table 2. Values 2, 3, 5, 6, 7,
and 9 in Table 12 are for configurations in which the third CDM
group is configured for a first panel. Furthermore, Values 2, 5, 6,
and 7 are for (N.sub.cw1, N.sub.cw2)=(2, 1) and Value {2, 7} and
{5, 6} are two paired options for DMRS indication for two scheduled
UEs with multi-panel transmission. Moreover, Values 3 and 9 are for
(N.sub.cw1, N.sub.cw2)=(1, 2) which may provide more flexibility to
a gNB. Values 2, 3, 4, 5, 6, and 8 in Table 12 are for
configurations in which the third CDM group is configured for a
second panel. Values 2 and 8 are for (N.sub.cw1, N.sub.cw2)=(2, 1)
of a single UE and Values 3, 4, 5, and 6 are for (N.sub.cw1,
N.sub.cw2)=(1, 2). Values {3, 4} and {5, 6} are two paired options
for DMRS indication for two scheduled UEs with multi-panel
transmission. In one embodiment, if a first UE is indicated Value 5
in Table 12, a second UE must be indicated Value 6. The DMRS group
configuration for Table 12 is: transform precoder is disabled;
dmrs-Type=2; maxLength=1; and rank=3.
TABLE-US-00012 TABLE 12 Number of DMRS CDM DMRS Value group(s)
without data port(s) N.sub.cw1, N.sub.cw2 0 2 0; 2, 3 1, 2 1 2 0,
1; 2 2, 1 2 3 0, 1; 2 2, 1 3 3 0; 2, 3 1, 2 4 3 1; 4, 5 1, 2 5 3 0,
4; 2(0; 4, 2) 2, 1(1, 2) 6 3 1, 5; 3(1; 5, 3) 2, 1(1, 2) 7 3 4, 5;
3 2, 1 8 3 0, 1; 4 2, 1 9 3 5; 2, 3 1, 2 10-15 Reserved Reserved
Reserved
[0069] Table 13 through Table 15 are for DMRS port indication of a
total of four, five, and six DMRS ports for both codewords,
respectively. Moreover, there are a total of four ports for two CDM
groups and six ports for three CDM groups. The configurations of
Tables 13 through 15 cannot support MU configurations because they
each use at least four ports. The first entry in Table 13 is for
two CDM groups which duplicates information found in Table 3.
Values 1, 2, 3, and 5 in Table 13 are for configurations in which
the third CDM group is configured for a first panel. Moreover,
Values 1, 2, and 5 in Table 13 are for (N.sub.cw1, N.sub.cw2)=(2,
2) which may provide more flexibility to a gNB, and Value 3 is for
(N.sub.cw1, N.sub.cw2)=(3, 1). Values 1 to 4 in Table 13 are for
configurations in which the third CDM group is configured for a
second panel. Moreover, Value 1 is for (N.sub.cw1, N.sub.cw2)=(1,
3) and Values 2, 3, and 4 are for (N.sub.cw1, N.sub.cw2)=(2,
2).
[0070] Values 0 and 1 in Table 14 are used for configurations in
which the third CDM group is configured for either a first panel or
a second panel. For example, if the third CDM group is configured
for a first panel, Values 0 and 1 in Table 14 are used for
(N.sub.cw1, N.sub.cw2)=(3, 2) and (N.sub.cw1, N.sub.cw2)=(4, 1),
respectively. Moreover, if the third CDM group is configured for a
second panel, Values 0 and 1 in Table 14 are used for (N.sub.cw1,
N.sub.cw2)=(1, 4) and (N.sub.cw1, N.sub.cw2)=(2, 3), respectively.
Value 0 in Table 15 for the third CDM group configured for a first
panel is for (N.sub.cw1, N.sub.cw2)=(4, 2) and Value 0 in Table 15
for the third CDM group configured for a second panel is for
(N.sub.cw1, N.sub.cw2)=(2, 4). The DMRS group configuration for
Table 13 is: transform precoder is disabled; dmrs-Type=2;
maxLength=1; and rank=4.
TABLE-US-00013 TABLE 13 Number of DMRS CDM DMRS Value group(s)
without data port(s) N.sub.cw1, N.sub.cw2 0 2 0, 1; 2, 3 2, 2 1 3
1, 4; 2, 3(1; 4, 2, 3) 2, 2(1, 3) 2 3 0, 1; 2, 3 2, 2 3 3 0, 1, 4;
2(0, 1; 4, 2) 3, 1(2, 2) 4 3 0, 1; 4, 5 2, 2 5 3 4, 5; 2, 3 2, 2
6-15 Reserved Reserved Reserved
[0071] The DMRS group configuration for Table 14 is: transform
precoder is disabled; dmrs-Type=2; maxLength=1; and rank=5.
TABLE-US-00014 TABLE 14 Number of DMRS CDM DMRS Value group(s)
without data port(s) N.sub.cw1, N.sub.cw2 0 3 1, 4, 5; 2, 3(1; 4,
5, 2, 3) 3, 2(1, 4) 1 3 0, 1, 4, 5; 2(0, 1; 4, 5, 2) 4, 1(2, 3)
2-15 Reserved Reserved Reserved
[0072] The DMRS group configuration for Table 15 is: transform
precoder is disabled; dmrs-Type=2; maxLength=1; and rank=6.
TABLE-US-00015 TABLE 15 Number of DMRS CDM DMRS Value group(s)
without data port(s) N.sub.cw1, N.sub.cw2 0 3 0, 1, 4, 5; 2, 4,
2(2, 4) 3(0, 1; 4, 5, 2, 3) 1-15 Reserved Reserved Reserved
[0073] Table 16 through Table 22 correspond to DMRS port indication
for DMRS type 2 with a maximum length of front-load DMRS being two
symbols. Specifically, Table 16 is for a total of two DMRS ports
for both codewords with a single port for each codeword. Moreover,
the first eight entries in Table 16 are for one symbol front-load
DMRS which duplicate information found in Table 11. There are a
total of eight ports for two CDM groups with two symbols front-load
DMRS and twelve ports for three CDM groups with two symbols
front-load DMRS. The configurations of Table 16 may support up to
four co-scheduled UEs with multi-panel transmission. Furthermore,
the first four entries of two symbol front-load DMRS are for two
CDM groups that may support up to four co-scheduled UEs with
multi-panel transmission. As may be appreciated, the DMRS ports of
co-scheduled UEs must be orthogonal such that different entries are
indicated to different UEs. Values 12, 13, 14, 15, 20, 21, 22, and
23 in Table 16 are for DMRS port indication for the third CDM group
configured for a first panel. Moreover, Values {12, 13, 14, 15} and
{20, 21, 22, 23} in Table 16 are two paired options for DMRS
indication for four scheduled UEs. For example, if a UE is
indicated Value 12 in Table 16, a co-scheduled UE with multi-panel
transmission must be indicated one of Values {13, 14, 15}. The two
paired options are different because different DMRS ports are used
which may provide more flexibility to a gNB. Values 12 to 19 are
for the third CDM group configured for a second panel. Moreover,
Values {12, 13, 14, 15} and {16, 17, 18, 19} in Table 16 are two
paired options for DMRS indication for four scheduled UEs with
multi-panel transmission. The DMRS group configuration for Table 16
is: transform precoder is disabled; dmrs-Type=2; maxLength=2; and
rank=2.
TABLE-US-00016 TABLE 16 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols N.sub.cw1, N.sub.cw2
0 2 0; 2 1 1, 1 1 2 1; 3 1 1, 1 2 3 0; 2 1 1, 1 3 3 1; 3 1 1, 1 4 3
4; 2 1 1, 1 5 3 5; 3 1 1, 1 6 3 0; 4 1 1, 1 7 3 1; 5 1 1, 1 8 2 0;
2 2 1, 1 9 2 1; 3 2 1, 1 10 2 6; 8 2 1, 1 11 2 7; 9 2 1, 1 12 3 0;
2 2 1, 1 13 3 1; 3 2 1, 1 14 3 6; 8 2 1, 1 15 3 7; 9 2 1, 1 16 3 0;
4 2 1, 1 17 3 1; 5 2 1, 1 18 3 6; 10 2 1, 1 19 3 7; 11 2 1, 1 20 3
4; 2 2 1, 1 21 3 5; 3 2 1, 1 22 3 10; 8 2 1, 1 23 3 11; 9 2 1, 1
24-31 Reserved Reserved Reserved Reserved
[0074] Table 17 is for a total of three DMRS ports for both
codewords. Moreover, the first ten entries in Table 17 are for one
symbol front-load DMRS which duplicate information found in Table
12. The configuration of Table 17 may support up to four
co-scheduled UEs with multi-panel transmission. Furthermore, the
first four entries of two symbol front-load DMRS are for two CDM
groups which may support up to two co-scheduled UEs with
multi-panel transmission. Values 10 and 11 are for (N.sub.cw1,
N.sub.cw2)=(1, 2) and Value 12 and 13 are for (N.sub.cw1,
N.sub.cw2)=(2, 1). Moreover, Values 14 to 17 and Value 22 to 29 in
Table 17 are for third CDM group configured for a first panel.
Values {16, 17, 22, 24} and {26, 27, 28, 29} are for (N.sub.cw1,
N.sub.cw2)=(2, 1) which are two paired options for DMRS indication
for up to four scheduled UEs with multi-panel transmission.
Furthermore, Values {14, 15} and {23, 25} are for (N.sub.cw1,
N.sub.cw2)=(1, 2) which are two paired options for DMRS indication
for up to two scheduled UEs with multi-panel transmission. Values
14 to 21 and Values 26 to 29 in Table 17 are for the third CDM
group configured for a second panel. Moreover, Values {14, 15, 19,
21} and {26, 27, 28, 29} are for (N.sub.cw1, N.sub.cw2)=(1, 2)
which are two paired options for DMRS indication for up to four
scheduled UEs with multi-panel transmission. Values {16, 17} and
{18, 20} are for (N.sub.cw1, N.sub.cw2)=(2, 1) which are two paired
options for DMRS indication for up to two scheduled UEs with
multi-panel transmission. The DMRS group configuration for Table 17
is: transform precoder is disabled; dmrs-Type=2; maxLength=2; and
rank=3.
TABLE-US-00017 TABLE 17 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols N.sub.cw1, N.sub.cw2
0 2 0; 2, 3 1 1, 2 1 2 0, 1; 2 1 2, 1 2 3 0, 1; 2 1 2, 1 3 3 0; 2,
3 1 1, 2 4 3 1; 4, 5 1 1, 2 5 3 0, 4; 2(0; 4, 2) 1 2, 1(1, 2) 6 3
1, 5; 3(1; 5, 3) 1 2, 1(1, 2) 7 3 4, 5; 3 1 2, 1 8 3 0, 1; 4 1 2, 1
9 3 5; 2, 3 1 1, 2 10 2 0; 2, 3 2 1, 2 11 2 7; 8, 9 2 1, 2 12 2 0,
1; 2 2 2, 1 13 2 6, 7; 9 2 2, 1 14 3 0; 2, 3 2 1, 2 15 3 7; 8, 9 2
1, 2 16 3 0, 1; 2 2 2, 1 17 3 6, 7; 9 2 2, 1 18 3 0, 1; 4 2 2, 1 19
3 1; 4, 5 2 1, 2 20 3 6, 7; 11 2 2, 1 21 3 6; 10, 11 2 1, 2 22 3 4,
5; 3 2 2, 1 23 3 5; 2, 3 2 1, 2 24 3 10, 11; 8 2 2, 1 25 3 11; 8, 9
2 1, 2 26 3 0, 4; 2(0; 4, 2) 2 2, 1(1, 2) 27 3 1, 5; 3(1; 5, 3) 2
2, 1(1, 2) 28 3 6, 10; 8(6; 8, 10) 2 2, 1(1, 2) 29 3 7, 11; 9(7;
11, 9) 2 2, 1(1, 2) 30-31 Reserved Reserved Reserved Reserved
[0075] Table 18 is for a total of four DMRS ports for both
codewords. Moreover, the first six entries in Table 18 are for one
symbol front-load DMRS which duplicate information found in Table
13. The configuration of Table 18 may support up to two
co-scheduled UEs with multi-panel transmission. Furthermore, the
first four entries of two symbol front-load DMRS are for two CDM
groups which may support up to two co-scheduled UEs with
multi-panel transmission. Values 7 and 8 in Table 18 are for
(N.sub.cw1, N.sub.cw2)=(2, 2) for up to two co-scheduled UEs and
each scheduled UE has two DMRS ports for each codewords. Moreover,
Value 6 in Table 18 is for (N.sub.cw1, N.sub.cw2)=(1, 3) and Value
9 is for (N.sub.cw1, N.sub.cw2)=(3, 1). Values 6 and 9 may also be
used for DMRS ports indication for two scheduled UEs in which
(N.sub.cw1, N.sub.cw2) of a first UE is (1, 3) and (N.sub.cw1,
N.sub.cw2) of a second UE is (3, 1). Values 10 to 13 and 18 to 21
in Table 18 may be used for the third CDM group configured for a
first panel. Moreover, Values {11, 12} and {18, 19} may be for
(N.sub.cw1, N.sub.cw2)=(2, 2) which are two paired options for DMRS
indication for up to two scheduled UEs with multi-panel
transmission. Values 10 and 20 may be for (N.sub.cw1,
N.sub.cw2)=(1, 3) and Values 13 and 21 may be for (N.sub.cw1,
N.sub.cw2)=(3, 1). Furthermore, Values {10, 13} and {20, 21} may
support up to two scheduled UEs in which (N.sub.cw1, N.sub.cw2) of
a first UE is (1, 3) and (N.sub.cw1, N.sub.cw2) of a second UE is
(3, 1). Values 10 to 17 may be for the third CDM group configured
for a second panel. Values {11, 12} and {16, 17} may be for
(N.sub.cw1, N.sub.cw2)=(2, 2) which are two paired options for DMRS
indication for up to two scheduled UEs with multi-panel
transmission. Moreover, Values 10 and 14 may be for (N.sub.cw1,
N.sub.cw2)=(1, 3) and Values 13 and 15 may be for (N.sub.cw1,
N.sub.cw2)=(3, 1). Values {10, 13} and {14, 15} may support up to
two scheduled UEs in which (N.sub.cw1, N.sub.cw2) of a first UE is
(1, 3) and (N.sub.cw1, N.sub.cw2) of a second UE is (3, 1). The
DMRS group configuration for Table 18 is: transform precoder is
disabled; dmrs-Type=2; maxLength=2; and rank=4.
TABLE-US-00018 TABLE 18 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols N.sub.cw1, N.sub.cw2
0 2 0, 1; 2, 3 1 2, 2 1 3 1, 4; 2, 1 2, 2(1, 3) 3(1; 4, 2, 3) 2 3
0, 1; 2, 3 1 2, 2 3 3 0, 1, 4; 1 3, 1(2, 2) 2(0, 1; 4, 2) 4 3 0, 1;
4, 5 1 2, 2 5 3 4, 5; 2, 3 1 2, 2 6 2 7; 2, 3, 8 2 1, 3 7 2 0, 1;
2, 3 2 2, 2 8 2 6, 7; 8, 9 2 2, 2 9 2 0, 1, 6; 9 2 3, 1 10 3 7; 2,
3, 8 2 1, 3 11 3 0, 1; 2, 3 2 2, 2 12 3 6, 7; 8, 9 2 2, 2 13 3 0,
1, 6; 9 2 3, 1 14 3 7; 4, 5, 10 2 1, 3 15 3 0, 1, 6; 11 2 3, 1 16 3
0, 1; 4, 5 2 2, 2 17 3 6, 7; 10, 11 2 2, 2 18 3 4, 5; 2, 3 2 2, 2
19 3 10, 11; 8, 9 2 2, 2 20 3 11; 2, 3, 8 2 1, 3 21 3 4, 5, 10; 9 2
3, 1 22-31 Reserved Reserved Reserved Reserved
[0076] Table 19 is for a total of five DMRS ports for both
codewords. Moreover, the first two entries in Table 19 are for one
symbol front-load DMRS which duplicate information found in Table
14. The first four entries of two symbol front-load DMRS are for
two CDM groups that can't support MU configurations, but three CDM
groups may support up to two co-scheduled UEs with multi-panel
transmission. Furthermore, the Values 2, 3, 4, and 5 in Table 19
are for (N.sub.cw1, N.sub.cw2)=(1, 4), (N.sub.cw1, N.sub.cw2)=(2,
3), (N.sub.cw1, N.sub.cw2), =(3, 2) and (N.sub.cw1, N.sub.cw2)=(4,
1), respectively.
[0077] Values 6, 8, 10, 11, 12, 13, 15, and 17 in Table 19 are for
the third CDM group configured for a first panel. Moreover, Values
{10, 11} and {12, 13} are two options for DMRS indication for up to
two scheduled UEs. The configuration of Table 19 may support up to
two co-scheduled UEs with multi-panel transmission. Furthermore,
the configuration of Table 19 may support up to two co-scheduled
UEs with multi-panel transmission for (N.sub.cw1, N.sub.cw2)=(3, 2)
and (N.sub.cw1, N.sub.cw2)=(4, 1). Values 6 and 15 are for
(N.sub.cw1, N.sub.cw2)=(1, 4) and Values 8 and 17 are for
(N.sub.cw1, N.sub.cw2)=(2, 3) for a single UE. Moreover, Values 6,
7, 8, 9, 10, 12, 14, and 16 in Table 19 are for the third CDM group
configured for a second panel. Values {6, 7} and {8, 9} are two
options for DMRS indication for up to two scheduled UEs for
(N.sub.cw1, N.sub.cw2)=(1, 4) and (N.sub.cw1, N.sub.cw2)=(2, 3),
respectively. Furthermore, Values 10 and 16 are for (N.sub.cw1,
N.sub.cw2)=(3, 2) and Values 12 and 14 are for (N.sub.cw1,
N.sub.cw2)=(4, 1) for a single UE. The DMRS group configuration for
Table 19 is: transform precoder is disabled; dmrs-Type=2;
maxLength=2; and rank=5.
TABLE-US-00019 TABLE 19 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols N.sub.cw1, N.sub.cw2
0 3 1, 4, 5; 2, 1 3, 2(1, 4) 3(1; 4, 5, 2, 3) 1 3 0, 1, 4, 5; 1 4,
1(2, 3) 2(0, 1; 4, 5, 2), 2 2 7; 2, 3, 8, 9 2 1, 4 3 2 0, 1; 2, 3,
8 2 2, 3 4 2 0, 1, 6; 2, 3 2 3, 2 5 2 0, 1, 6, 7; 9 2 4, 1 6 3 7;
2, 3, 8, 9 2 1, 4 7 3 0; 4, 5, 10, 11 2 1, 4 8 3 0, 1; 2, 3, 8 2 2,
3 9 3 6, 7; 4, 5, 10 2 2, 3 10 3 0, 1, 6; 2, 3 2 3, 2 11 3 4, 5,
10; 8, 9 2 3, 2 12 3 0, 1, 6, 7; 2 2 4, 1 13 3 4, 5, 10, 11; 9 2 4,
1 14 3 0, 1, 6, 7; 11 2 4, 1 15 3 11; 2, 3, 8, 9 2 1, 4 16 3 0, 1,
6; 4, 5 2 3, 2 17 3 10, 11; 2, 3, 8 2 2, 3 18-31 Reserved Reserved
Reserved Reserved
[0078] Table 20 is for a total of six DMRS ports for both
codewords. Moreover, the first entry in Table 20 is for one symbol
front-load DMRS which duplicates information found in Table 15. The
first three entries of two symbol front-load DMRS are for two CDM
groups that can't support MU configurations, but three CDM groups
may support up to two co-scheduled UEs with multi-panel
transmission. Furthermore, the Values 1, 2, and 3 in Table 20 are
for (N.sub.cw1, N.sub.cw2)=(2, 4), (N.sub.cw1, N.sub.cw2)=(3, 3),
and (N.sub.cw1, N.sub.cw2)=(4, 2), respectively.
[0079] Values 4, 6, 7, 8, 10, and 12 in Table 20 are for the third
CDM group configured for a first panel. Moreover, Values 7 and 8
are two options for DMRS indication for up to two scheduled UEs.
The configuration of Table 20 may support up to two co-scheduled
UEs with multi-panel transmission for (N.sub.cw1, N.sub.cw2)=(4,
2). Furthermore, Values 4 and 12 are for (N.sub.cw1, N.sub.cw2)=(2,
4) and values 6 and 10 are for (N.sub.cw1, N.sub.cw2)=(3, 3) for a
single UE which enable a gNB more flexibility. Values 4, 5, 6, 7,
9, and 11 in Table 20 are for the third CDM group configured for a
second panel. Moreover, Values 4 and 5 are two options for DMRS
indication for up to two scheduled UEs for (N.sub.cw1,
N.sub.cw2)=(2, 4). Values 7 and 11 are for (N.sub.cw1,
N.sub.cw2)=(4, 2) and Values 6 and 9 are for (N.sub.cw1,
N.sub.cw2)=(3, 3) for a single UE. The DMRS group configuration for
Table 20 is: transform precoder is disabled; dmrs-Type=2;
maxLength=2; and rank=6.
TABLE-US-00020 TABLE 20 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols N.sub.cw1, N.sub.cw2
0 3 0, 1, 4, 5; 2, 1 4, 2(2, 4) 3(0, 1; 4, 5, 2, 3) 1 2 0, 1; 2, 3,
8, 9 2 2, 4 2 2 0, 1, 6; 2, 3, 8 2 3, 3 3 2 0, 1, 6, 7; 2, 3 2 4, 2
4 3 0, 1; 2, 3, 8, 9 2 2, 4 5 3 6, 7; 4, 5, 10, 11 2 2, 4 6 3 0, 1,
6; 2, 3, 8 2 3, 3 7 3 0, 1, 6, 7; 2, 3 2 4, 2 8 3 4, 5, 10, 11; 8,
9 2 4, 2 9 3 0, 1, 6; 4, 5, 10 2 3, 3 10 3 4, 5, 10; 2, 3, 8 2 3, 3
11 3 0, 1, 6, 7; 4, 5 2 4, 2 12 3 10, 11; 2, 3, 8, 9 2 2, 4 13-31
Reserved Reserved Reserved Reserved
[0080] Table 21 and Table 22 are for DMRS port indication for a
total of seven and eight DMRS ports for both codewords,
respectively. There are a total of eight ports for two CDM groups
and twelve ports for three CDM groups with two symbol front-load
DMRS. Tables 21 and 22 cannot support MU scenario for more than six
ports of a UE. Moreover, Tables 21 and 22 do not contain one symbol
of front-load DMRS because one symbol front-load DMRS may only
support up to six DMRS ports transmission. The first two entries in
Table 21 of two symbol front-load DMRS are for two CDM groups.
Furthermore, the Values 0 and 1 in Table 21 are for (N.sub.cw1,
N.sub.cw2)=(3, 4) and (N.sub.cw1, N.sub.cw2)=(4, 3),
respectively.
[0081] Values 2, 3, 6, and 7 in Table 21 are for the third CDM
group configured for a first panel. Moreover, Values 2 and 7 are
for (N.sub.cw1, N.sub.cw2)=(3, 4) and Values 3 and 6 are for
(N.sub.cw1, N.sub.cw2)=(4, 3) for a single UE. Values 2 to 5 in
Table 21 are for the third CDM group configured for a second panel.
Furthermore, Values 2 and 4 are for (N.sub.cw1, N.sub.cw2)=(3, 4)
and Values 3 and 5 are for (N.sub.cw1, N.sub.cw2)=(4, 3) for a
single UE.
[0082] The first entry in Table 22 is for two CDM groups. Moreover,
Value 0 in Table 22 is for (N.sub.cw1, N.sub.cw2)=(4, 4). Values 1
and 3 in Table 22 are for the third CDM group configured for a
first panel for (N.sub.cw1, N.sub.cw2)=(4, 4). Furthermore, Values
1 and 2 in Table 22 are for the third CDM group configured for a
second panel for (N.sub.cw1, N.sub.cw2)=(4, 4) for a single UE. The
DMRS group configuration for Table 21 is: transform precoder is
disabled; dmrs-Type=2; maxLength=2; and rank=7.
TABLE-US-00021 TABLE 21 Number of DMRS Number CDM group(s) of
front- N.sub.cw1, Value without data DMRS port(s) load symbols
N.sub.cw2 0 2 0, 1, 6; 2, 3, 8, 9 2 3, 4 1 2 0, 1, 6, 7; 2, 3, 8 2
4, 3 2 3 0, 1, 6; 2, 3, 8, 9 2 3, 4 3 3 0, 1, 6, 7; 2, 3, 8 2 4, 3
4 3 0, 1, 6; 4, 5, 10, 11 2 3, 4 5 3 0, 1, 6, 7; 4, 5, 10 2 4, 3 6
3 4, 5, 10, 11; 2, 3, 8 2 4, 3 7 3 4, 5, 10; 2, 3, 8, 9 2 3, 4 8-31
Reserved Reserved Reserved Reserved
[0083] The DMRS group configuration for Table 22 is: transform
precoder is disabled; dmrs-Type=2; maxLength=2; and rank=8.
TABLE-US-00022 TABLE 22 Number of DMRS CDM Number of front-load
Value group(s) without data DMRS port(s) symbols N.sub.cw1,
N.sub.cw2 0 2 0, 1, 6, 7; 2, 3, 8, 9 2 4, 4 1 3 0, 1, 6, 7; 2, 3,
8, 9 2 4, 4 2 3 0, 1, 6, 7; 4, 5, 10, 11 2 4, 4 3 3 4, 5, 10, 11;
2, 3, 8, 9 2 4, 4 4-31 Reserved Reserved Reserved Reserved
[0084] In some embodiments, a DMRS group may be used to support
multi-TRP and/or multi-panel PDSCH and/or PUSCH transmission. In
such embodiments, DMRS ports within a DMRS group may be QCL, and
DMRS ports from different groups may not be QCL. In certain
embodiments, one DMRS group is QCL with one or more RSs indicated
by TCI states in DCI or SRI in an UL grant. In such embodiments,
the DMRS ports transmitted from a TRP and/or panel may be selected
from within one DMRS group. In various embodiments, a DMRS group
may include one or two CDM groups. In such embodiments, a CDM group
can only be configured to one DMRS group (e.g., a CDM group cannot
be configured to more than one DMRS group). In some embodiments,
two DMRS groups are used for two codewords transmitted from two
TRPs and/or panels. In certain embodiments, DMRS ports in a first
DMRS group for PDSCH may be received with the same beam as the
reception of one or more RSs from the first TRP 402 and DMRS ports
in a second DMRS group for PDSCH may be received with the same beam
as the reception of one or more RSs from the second TRP 404. In
various embodiments, DMRS ports in a first DMRS group for PUSCH may
be transmitted with the same beam as the transmission of one or
more SRS resources from a first panel and DMRS ports in a second
DMRS group for PUSCH may be transmitted with the same beam as the
transmission of one or more SRS resources from a second panel.
[0085] In certain embodiments, for DMRS type 1 with two CDM groups,
each DMRS group may include one CDM group. In such embodiments, a
first DMRS group contains a first CDM group used for the first TRP
402 or the first panel, and a second DMRS group contains a second
CDM group used for the second TRP 404 or the second panel. In
various embodiments, a difference between different CDM groups is
an offset of one RB in a frequency domain. In some embodiments, a
DMRS group ID may be used as a panel ID, or a panel ID may be used
as a DMRS group ID. In such embodiments, the DMRS group ID may be
used as the panel ID explicitly or implicitly, or the panel ID may
be used as the DMRS group ID explicitly or implicitly.
[0086] In certain embodiments, for DMRS type 2 with three CDM
groups and one symbol front-load DMRS, if a link quality between
one TRP and one panel is good at a certain time, a corresponding
DMRS group may be configured with two CDM groups to support up to
four ports. However, if the link become bad, the DMRS group may be
configured with only one CDM group. In various embodiments, for
DMRS type 2, a DMRS group configuration may be indicated in DCI. In
one embodiment, a first DMRS group may contain (e.g., always
contains) a first CDM group used for the first TRP 402 or the first
panel, and a second DMRS group may contain (e.g., always contains)
a second CDM group used for the second TRP 404 or the second panel.
In some embodiments, one bit in DCI may be used to indicate whether
a third CDM group is in a first DMRS group or in a second DMRS
group. In certain embodiments, two bits in DCI may be used to
indicate whether a third CDM group is in a first DMRS group, in a
second DMRS group, or not in any DMRS group (e.g., in no DMRS
group).
[0087] As may be appreciated, by dividing DMRS ports into DMRS
groups, a UE does not need to know a number of layers that
correspond to each codeword. For example, if a UE knows the
contents of a DMRS group, it can easily know which DMRS ports are
QCL that may be transmitted with the same beam and which ports
cannot be transmitted with the same beam.
[0088] For embodiments that use DMRS groups, Tables 1 through 22
may be used for UL transmission; however, the DMRS ports do not
need to be in any particular order. Tables 23 through 26 may be
used for DL transmission. As long as the UE has the information
needed to select the correct table, has a Value for the table, and
has the DMRS group information, the UE may know which DMRS ports to
use for which codewords. As may be appreciated, any of the tables
found herein are examples of possible tables. However, it should be
noted that, in some embodiments, the actual tables used may be
similar to the tables found herein, but may have different
ordering, DMRS ports, etc.
[0089] In one example, there are two codewords of a PUSCH and each
codeword is transmitted from one panel. Moreover, the DMRS
configuration for the PUSCH transmission is type 2 and the maximum
length of front-load DMRS is one. Accordingly, there are a total of
three CDM groups and each CDM group has up to two ports. In such an
example, DMRS ports index in a first CDM group are ports 0/1, DMRS
ports in a second CDM group are ports 2/3, and DMRS ports in a
third CDM group are ports 4/5. Moreover, an UL grant comprises an
indication indicating that the third CDM group belongs to the first
DMRS group (e.g., a bit is 0 indicating that the third CDM group
belongs to the first DMRS group); therefore, the first DMRS group
contains the first CDM group and the third CDM group, and the
second DMRS group contains the second CDM group. In this example,
if the number of layers of the two codewords are two and two,
respectively, then the gNB may indicate to the UE 406 one of Values
{0, 1, 2, 5} in Table 13. For example, Value 1 may be indicated in
the UL grant, then the UE 406 may transmit using the DMRS ports in
the first DMRS group (e.g., ports 1/4) with the same beam as the
transmission of SRS resources from a first panel and transmit using
the DMRS ports in the second DMRS group (e.g., ports 2/3) with the
same beam as the transmission of SRS resources from a second
panel.
[0090] In another example, there are two codewords of a PDSCH and
each codeword is transmitted from one TRP. Moreover, the DMRS
configuration for the PDSCH transmission is type 2 and the maximum
length of front-load DMRS is two. Accordingly, there are a total of
three CDM groups and each CDM group with up to four ports. In such
an example, DMRS ports index in a first CDM group are ports
0/1/6/7, DMRS ports in a second CDM group are ports 2/3/8/9, and
DMRS ports in a third CDM group are ports 4/5/10/11. Moreover, DCI
comprises an indication indicating that the third CDM group belongs
to the second DMRS group (e.g., a bit is 1 indicating that the
third CDM group belongs to the second DMRS group); therefore, the
first DMRS group contains the first CDM group transmitted from the
first TRP 402, and the second DMRS group contains the second CDM
group and the third CDM group transmitted from the second TRP 404.
In this example, if the number of layers of the two codewords are
two and four, respectively, then the gNB may indicate to the UE 406
one of Values {16, 45, 46} in Table 26. For example, Value 46 may
be indicated in DCI, then the UE 406 may receive information using
the DMRS ports in the first DMRS group (e.g., port 6/7) with the
same beam as the reception of RSs from the first TRP 402 and
receive DMRS ports in the second DMRS group (e.g., ports 4/5/10/11)
with the same beam as the reception of RSs from the second TRP
404.
[0091] The DMRS group configuration for Table 23 is: transform
precoder is disabled; dmrs-Type=1; and maxLength=1.
TABLE-US-00023 TABLE 23 Value Number of DMRS CDM group(s) without
data DMRS port(s) 0 2 0, 2 1 2 1, 3 2 2 0, 2, 3 3 2 0, 1, 2 4 2 0,
1, 2, 3 5-8 Reserved Reserved
[0092] The DMRS group configuration for Table 24 is: transform
precoder is disabled; dmrs-Type=1; and maxLength=2.
TABLE-US-00024 TABLE 24 Number of DMRS CDM Number of Value group(s)
without data DMRS port(s) front-load symbols 0 2 0, 2 1 1 2 1, 3 1
2 2 0, 2, 3 1 3 2 0, 1, 2 1 4 2 0, 1, 2, 3 1 5 2 0, 2 2 6 2 1, 3 2
7 2 4, 6 2 8 2 5, 7 2 9 2 0, 2, 3 2 10 2 0, 1, 2 2 11 2 5, 6, 7 2
12 2 4, 5, 7 2 13 2 0, 1, 2, 3 2 14 2 4, 5, 6, 7 2 15 2 5, 2, 3, 6
2 16 2 0, 1, 4, 7 2 17 2 5, 2, 3, 6, 7 2 18 2 0, 1, 2, 3, 6 2 19 2
0, 1, 4, 2, 3 2 20 2 0, 1, 4, 5, 7 2 21 2 0, 1, 2, 3, 6, 7 2 22 2
0, 1, 4, 2, 3, 6 2 23 2 0, 1, 4, 5, 2, 3 2 24 2 0, 1, 4, 2, 3, 6, 7
2 25 2 0, 1, 4, 5, 2, 3, 6 2 26 2 0, 1, 4, 5, 2, 3, 6, 7 2 27-31
Reserved Reserved Reserved
[0093] The DMRS group configuration for Table 25 is: transform
precoder is disabled; dmrs-Type=2; and maxLength=1.
TABLE-US-00025 TABLE 25 Number of DMRS Value CDM group(s) without
data DMRS port(s) 0 2 0, 2 1 2 1, 3 2 2 0, 2, 3 3 2 0, 1, 2 4 2 0,
1, 2, 3 5 3 0, 2 6 3 1, 3 7 3 4, 2 8 3 5, 3 9 3 0, 4 10 3 1, 5 11 3
0, 1, 2 12 3 0, 2, 3 13 3 1, 4, 5 14 3 0, 4, 2 15 3 1, 5, 3 16 3 4,
5, 3 17 3 0, 1, 4 18 3 5, 2, 3 19 3 1, 4, 2, 3 20 3 0, 1, 2, 3 21 3
0, 1, 4, 2 22 3 0, 1, 4, 5 23 3 4, 5, 2, 3 24 3 1, 4, 5, 2, 3 25 3
0, 1, 4, 5, 2 26 3 0, 1, 4, 5, 2, 3 27-31 Reserved Reserved
[0094] The DMRS group configuration for Table 26 is: transform
precoder is disabled; dmrs-Type=2; and maxLength=2.
TABLE-US-00026 TABLE 26 Number of DMRS CDM Number of Value group(s)
without data DMRS port(s) front-load symbols 0 2 0, 2 1 1 2 1, 3 1
2 2 0, 2, 3 1 3 2 0, 1, 2 1 4 2 0, 1, 2, 3 1 5 3 0, 2 1 6 3 1, 3 1
7 3 0, 1, 2 1 8 3 0, 2, 3 1 9 3 1, 4, 5 1 10 3 4, 5, 3 1 11 3 1, 4,
2, 3 1 12 3 0, 1, 2, 3 1 13 3 0, 1, 4, 2 1 14 3 1, 4, 5, 2, 3 1 15
3 0, 1, 4, 5, 2 1 16 3 0, 1, 4, 5, 2, 3 1 17 3 0, 2 2 18 3 1, 3 2
19 3 6, 8 2 20 3 7, 9 2 21 3 0, 2, 3 2 22 3 7, 8, 9 2 23 3 0, 1, 2
2 24 3 6, 7, 9 2 25 3 1, 4, 5 2 26 3 6, 10, 11 2 27 3 4, 5, 3 2 28
3 10, 11, 8 2 29 3 0, 2, 3, 8 2 30 3 0, 1, 2, 3 2 31 3 6, 7, 8, 9 2
32 3 0, 1, 6, 2 2 33 3 7, 4, 5, 10 2 34 3 4, 5, 10, 9 2 35 3 1, 6,
7, 9 2 36 3 7, 3, 8, 9 2 37 3 7, 2, 3, 8, 9 2 38 3 0, 4, 5, 10, 11
2 39 3 0, 1, 2, 3, 8 2 40 3 6, 7, 4, 5, 10 2 41 3 0, 1, 6, 2, 3 2
42 3 4, 5, 10, 8, 9 2 43 3 0, 1, 6, 7, 2 2 44 3 4, 5, 10, 11, 9 2
45 3 0, 1, 6, 4, 5 2 46 3 10, 11, 2, 3, 8 2 47 3 0, 1, 2, 3, 8, 9 2
48 3 6, 7, 4, 5, 10, 11 2 49 3 0, 1, 6, 2, 3, 8 2 50 3 0, 1, 6, 7,
2, 3 2 51 3 4, 5, 10, 11, 8, 9 2 52 3 0, 1, 6, 7, 4, 5 2 53 3 10,
11, 2, 3, 8, 9 2 54 3 0, 1, 6, 2, 3, 8, 9 2 55 3 0, 1, 6, 7, 2, 3,
8 2 56 3 0, 1, 6, 7; 2, 3, 8, 9 2 57-63 Reserved Reserved
Reserved
[0095] In some embodiments, for multiple PDCCH based multi-TRP
and/or multi-panel transmission, each of the first TRP 402 and the
second TRP 404 may schedule its own PDSCH and PUSCH independently.
As may be appreciated, because a message between the first TRP 402
and the second TRP 404 cannot be exchanged dynamically, RRC may
configure a CDM group index and a total number of CDM groups for a
TRP and/or panel to avoid a CDM group configured to more than one
panel. In certain embodiments, there may be fully overlapped PUSCH
resource allocation; therefore, orthogonal DMRS ports may be
allocated for each TRP and/or panel. For example, a first CDM group
may be assigned to a first panel and a second CDM group may be
assigned to a second panel.
[0096] In various embodiments, a gNB may indicate DMRS ports in a
CDM group or a DMRS group configured for its own TRP and/or panel.
Tables 27 through 30 may be used by the gNB to indicate the DMRS
ports. Tables 27 through 30 may be similar to tables used in other
configurations with the addition of more entries. In contrast,
Tables 31 through 66 may be new tables not used in other
configurations. The Tables 31 through 66 may be simplified from
Tables 27 through 30 to reduce a number of bits used in DCI to
indicate an entry in such tables.
[0097] Table 27 and Table 28 are for PUSCH transmission with
multi-panels. Table 29 and Table 30 are for PDSCH with multi-TRPs
transmission.
[0098] The DMRS group configuration for Table 27 is: transform
precoder is disabled; dmrs-Type=2; maxLength=1; and rank=3.
TABLE-US-00027 TABLE 27 Number of DMRS Value CDM group(s) without
data DMRS port(s) 0 2 0-2 1 3 0-2 2 3 3-5 3 3 0, 1, 4 4-15 Reserved
Reserved
[0099] The DMRS group configuration for Table 28 is: transform
precoder is disabled; dmrs-Type=2; maxLength=1; and rank=4.
TABLE-US-00028 TABLE 28 Value Number of DMRS CDM group(s) without
data DMRS port(s) 0 2 0-3 1 3 0-3 2 3 0, 1, 4, 5 3 3 2, 3, 4, 5
4-15 Reserved Reserved
[0100] The DMRS group configuration for Table 29 is: dmrs-Type=2;
and maxLength=1.
TABLE-US-00029 TABLE 29 One codeword: Two codewords: Codeword 0
enabled, Codeword 0 enabled, Codeword 1 disabled Codeword 1 enabled
Number Number of DMRS of DMRS CDM CDM group(s) group(s) without
DMRS without DMRS Value data port(s) Value data port(s) 0 1 0 0 3
0-4 1 1 1 1 3 0-5 2 1 0, 1 2-31 reserved reserved 3 2 0 4 2 1 5 2 2
6 2 3 7 2 0, 1 8 2 2, 3 9 2 0-2 10 2 0-3 11 3 0 12 3 1 13 3 2 14 3
3 15 3 4 16 3 5 17 3 0, 1 18 3 2, 3 19 3 4, 5 20 3 0-2 21 3 3-5 22
3 0-3 23 2 0, 2 24 3 0, 1, 4 25 3 0, 1, 4, 5 26 3 2, 3, 4, 5 27-31
Reserved Reserved
[0101] The DMRS group configuration for Table 30 is: dmrs-Type=2;
and maxLength=2.
TABLE-US-00030 TABLE 30 One codeword: Two Codewords: Codeword 0
enabled, Codeword 0 enabled, Codeword 1 disabled Codeword 1 enabled
Number of Number of DMRS CDM Number DMRS CDM Number group(s) of
front- group(s) of front- without DMRS load without DMRS load Value
data port(s) symbols Value data port(s) symbols 0 1 0 1 0 3 0-4 1 1
1 1 1 1 3 0-5 1 2 1 0, 1 1 2 2 0, 1, 2, 3, 6 2 3 2 0 1 3 2 0, 1, 2,
3, 6, 8 2 4 2 1 1 4 2 0, 1, 2, 3, 6, 7, 8 2 5 2 2 1 5 2 0, 1, 2, 3,
6, 7, 8, 9 2 6 2 3 1 6-63 Reserved Reserved Reserved 7 2 0, 1 1 8 2
2, 3 1 9 2 0-2 1 10 2 0-3 1 11 3 0 1 12 3 1 1 13 3 2 1 14 3 3 1 15
3 4 1 16 3 5 1 17 3 0, 1 1 18 3 2, 3 1 19 3 4, 5 1 20 3 0-2 1 21 3
3-5 1 22 3 0-3 1 23 2 0, 2 1 24 3 0 2 25 3 1 2 26 3 2 2 27 3 3 2 28
3 4 2 29 3 5 2 30 3 6 2 31 3 7 2 32 3 8 2 33 3 9 2 34 3 10 2 35 3
11 2 36 3 0, 1 2 37 3 2, 3 2 38 3 4, 5 2 39 3 6, 7 2 40 3 8, 9 2 41
3 10, 11 2 42 3 0, 1, 6 2 43 3 2, 3, 8 2 44 3 4, 5, 10 2 45 3 0, 1,
6, 7 2 46 3 2, 3, 8, 9 2 47 3 4, 5, 10, 11 2 48 1 0 2 49 1 1 2 50 1
6 2 51 1 7 2 52 1 0, 1 2 53 1 6, 7 2 54 2 0, 1 2 55 2 2, 3 2 56 2
6, 7 2 57 2 8, 9 2 58 3 0, 1, 4 1 59 3 0, 1, 4, 5 1 60 3 2, 3, 4, 5
1 61-63 Reserved Reserved Reserved
[0102] In some embodiments, Tables 31 through 58 may be used for
DMRS port indication for PUSCH, and Tables 59 through 66 may be
used for DMRS port indication for PDSCH. In such embodiments, for
DMRS type 1 with maxLength equals one, two bits may be saved
compared to other tables, and other configurations may save one bit
in DCI compared with other tables. Tables 31 through 66 may be used
as pairs of tables in which a first table is used for a first TRP
and/or panel and a second table is used for a second TRP and/or
panel. For example, Table 31 and Table 32 are for the same
configuration for a pair of TRPs and/or panels. If DMRS ports for a
first TRP and/or panel are indicated in Table 31, the DMRS ports
for a second TRP and/or panel are indicated in Table 32. Tables 33
and 34 are for another configuration for a pair of TRPs and/or
panels as are each two consecutive tables that follow Table 34. The
DMRS group configuration for Table 31 is: transform precoder is
disabled; dmrs-Type=1; maxLength=1; and rank=1.
TABLE-US-00031 TABLE 31 Number of DMRS Value CDM group(s) without
data DMRS port(s) 0 2 0 1 2 1
[0103] The DMRS group configuration for Table 32 is: transform
precoder is disabled; dmrs-Type=1; maxLength=1; and rank=1.
TABLE-US-00032 TABLE 32 Number of DMRS Value CDM group(s) without
data DMRS port(s) 0 2 2 1 2 3
[0104] The DMRS group configuration for Table 33 is: transform
precoder is disabled; dmrs-Type=1; maxLength=1; and rank=2.
TABLE-US-00033 TABLE 33 Number of DMRS Value CDM group(s) without
data DMRS port(s) 0 2 0, 1 1 Reserved Reserved
[0105] The DMRS group configuration for Table 34 is: transform
precoder is disabled; dmrs-Type=1; maxLength=1; and rank=2.
TABLE-US-00034 TABLE 34 Number of DMRS Value CDM group(s) without
data DMRS port(s) 0 2 2, 3 1 Reserved Reserved
[0106] The DMRS group configuration for Table 35 is: transform
precoder is disabled; dmrs-Type=1; maxLength=2; and rank=1.
TABLE-US-00035 TABLE 35 Number of DMRS CDM DMRS Number of
front-load Value group(s) without data port(s) symbols 0 2 0 1 1 2
1 1 2 2 0 2 3 2 1 2 4 2 4 2 5 2 5 2 6-7 Reserved Reserved
Reserved
[0107] The DMRS group configuration for Table 36 is: transform
precoder is disabled; dmrs-Type=1; maxLength=2; and rank=1.
TABLE-US-00036 TABLE 36 Number of DMRS CDM DMRS Number of
front-load Value group(s) without data port(s) symbols 0 2 2 1 1 2
3 1 2 2 2 2 3 2 3 2 4 2 6 2 5 2 7 2 6-7 Reserved Reserved
Reserved
[0108] The DMRS group configuration for Table 37 is: transform
precoder is disabled; dmrs-Type=1; maxLength=2; and rank=2.
TABLE-US-00037 TABLE 37 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols 0 2 0, 1 1 1 2 0, 1 2
2 2 4, 5 2 3 2 0, 4 2 4-7 Reserved Reserved Reserved
[0109] The DMRS group configuration for Table 38 is: transform
precoder is disabled; dmrs-Type=1; maxLength=2; and rank=2.
TABLE-US-00038 TABLE 38 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols 0 2 2, 3 1 1 2 2, 3 2
2 2 6, 7 2 3 2 2, 6 2 4-7 Reserved Reserved Reserved
[0110] The DMRS group configuration for Table 39 is: transform
precoder is disabled; dmrs-Type=1; maxLength=2; and rank=3.
TABLE-US-00039 TABLE 39 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols 0 2 0, 1, 4 2 1-7
Reserved Reserved Reserved
[0111] The DMRS group configuration for Table 40 is: transform
precoder is disabled; dmrs-Type=1; maxLength=2; and rank=3.
TABLE-US-00040 TABLE 40 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols 0 2 2, 3, 6 2 1-7
Reserved Reserved Reserved
[0112] The DMRS group configuration for Table 41 is: transform
precoder is disabled; dmrs-Type=1; maxLength=2; and rank=4.
TABLE-US-00041 TABLE 41 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols 0 2 0, 1, 4, 5 1 1-7
Reserved Reserved Reserved
[0113] The DMRS group configuration for Table 42 is: transform
precoder is disabled; dmrs-Type=1; maxLength=2; and rank=4.
TABLE-US-00042 TABLE 42 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols 0 2 2, 3, 6, 7 1 1-7
Reserved Reserved Reserved
[0114] The DMRS group configuration for Table 43 is: transform
precoder is disabled; dmrs-Type=2; maxLength=1; and rank=1.
TABLE-US-00043 TABLE 43 Number of DMRS CDM group(s) Value without
data DMRS port(s) 0 2 0 1 2 1 2 3 0 3 3 1 4 3 4 5 3 5 6-7 Reserved
Reserved
[0115] The DMRS group configuration for Table 44 is: transform
precoder is disabled; dmrs-Type=2; maxLength=1; and rank=1.
TABLE-US-00044 TABLE 44 Number of DMRS CDM group(s) Value without
data DMRS port(s) 0 2 2 1 2 3 2 3 2 3 3 3 4 3 4 5 3 5 6-7 Reserved
Reserved
[0116] The DMRS group configuration for Table 45 is: transform
precoder is disabled; dmrs-Type=2; maxLength=1; and rank=2.
TABLE-US-00045 TABLE 45 Number of DMRS CDM group(s) Value without
data DMRS port(s) 0 2 0, 1 1 3 4, 5 2 3 0, 4 3-7 Reserved
Reserved
[0117] The DMRS group configuration for Table 46 is: transform
precoder is disabled; dmrs-Type=2; maxLength=1; and rank=2.
TABLE-US-00046 TABLE 46 Number of DMRS CDM group(s) Value without
data DMRS port(s) 0 2 2, 3 1 3 4, 5 2 3 2, 4 3-7 Reserved
Reserved
[0118] The DMRS group configuration for Table 47 is: transform
precoder is disabled; dmrs-Type=2; maxLength=1; and rank=3.
TABLE-US-00047 TABLE 47 Number of DMRS CDM group(s) Value without
data DMRS port(s) 0 3 0, 1, 4 1-7 Reserved Reserved
[0119] The DMRS group configuration for Table 48 is: transform
precoder is disabled; dmrs-Type=2; maxLength=1; and rank=3.
TABLE-US-00048 TABLE 48 Number of DMRS CDM group(s) Value without
data DMRS port(s) 0 3 2, 3, 4 1-7 Reserved Reserved
[0120] The DMRS group configuration for Table 49 is: transform
precoder is disabled; dmrs-Type=2; maxLength=1; and rank=4.
TABLE-US-00049 TABLE 49 Number of DMRS CDM group(s) Value without
data DMRS port(s) 0 3 0, 1, 4, 5 1-7 Reserved Reserved
[0121] The DMRS group configuration for Table 50 is: transform
precoder is disabled; dmrs-Type=2; maxLength=1; and rank=4.
TABLE-US-00050 TABLE 50 Number of DMRS CDM group(s) Value without
data DMRS port(s) 0 3 2, 3, 4, 5 1-7 Reserved Reserved
[0122] The DMRS group configuration for Table 51 is: transform
precoder is disabled; dmrs-Type=2; maxLength=2; and rank=1.
TABLE-US-00051 TABLE 51 Number of DMRS Number of CDM group(s) DMRS
front-load Value without data port(s) symbols 0 2 0 1 1 2 1 1 2 3 0
1 3 3 1 1 4 3 4 1 5 3 5 1 6 3 0 2 7 3 1 2 8 3 4 2 9 3 5 2 10 3 6 2
11 3 7 2 12 3 10 2 13 3 11 2 14-15 Reserved Reserved Reserved
[0123] The DMRS group configuration for Table 52 is: transform
precoder is disabled; dmrs-Type=2; maxLength=2; and rank=1.
TABLE-US-00052 TABLE 52 Number of DMRS CDM DMRS Number of
front-load Value group(s) without data port(s) symbols 0 2 2, 1 1 2
3 1 2 3 2 1 3 3 3 1 4 3 4 1 5 3 5 1 6 3 2 2 7 3 3 2 8 3 4 2 9 3 5 2
10 3 8 2 11 3 9 2 12 3 10 2 13 3 11 2 14-15 Reserved Reserved
Reserved
[0124] The DMRS group configuration for Table 53 is: transform
precoder is disabled; dmrs-Type=2; maxLength=2; and rank=2.
TABLE-US-00053 TABLE 53 Number of DMRS CDM DMRS Number of
front-load Value group(s) without data port(s) symbols 0 2 0, 1 1 1
3 0, 1 1 2 3 4, 5 1 3 3 0, 4 1 4 2 0, 1 2 5 2 6, 7 2 6 3 0, 1 2 7 3
4, 5 2 8 3 6, 7 2 9 3 10, 11 2 10 3 0, 4 2 11-15 Reserved Reserved
Reserved
[0125] The DMRS group configuration for Table 54 is: transform
precoder is disabled; dmrs-Type=2; maxLength=2; and rank=2.
TABLE-US-00054 TABLE 54 Number of DMRS CDM DMRS Number of
front-load Value group(s) without data port(s) symbols 0 2 2, 3 1 1
3 2, 3 1 2 3 4, 5 1 3 3 2, 4 1 4 2 2, 3 2 5 2 8, 9 2 6 3 2, 3 2 7 3
4, 5 2 8 3 8, 9 2 9 3 10, 11 2 10 3 2, 4 2 11-15 Reserved Reserved
Reserved
[0126] The DMRS group configuration for Table 55 is: transform
precoder is disabled; dmrs-Type=2; maxLength=2; and rank=3.
TABLE-US-00055 TABLE 55 Number of DMRS CDM DMRS Number of
front-load Value group(s) without data port(s) symbols 0 3 0, 1, 4
1 1 2 0, 1, 6 2 2 3 0, 1, 4 2 3 3 4, 5, 10 2 4 3 0, 1, 6 2 5-15
Reserved Reserved Reserved
[0127] The DMRS group configuration for Table 56 is: transform
precoder is disabled; dmrs-Type=2; maxLength=2; and rank=3.
TABLE-US-00056 TABLE 56 Number of DMRS CDM DMRS Number of
front-load Value group(s) without data port(s) symbols 0 3 2, 3, 4
1 1 2 2, 3, 8 2 2 3 2, 3, 4 2 3 3 4, 5, 10 2 4 3 2, 3, 8 2 5-15
Reserved Reserved Reserved
[0128] The DMRS group configuration for Table 57 is: transform
precoder is disabled; dmrs-Type=2; maxLength=2; and rank=4.
TABLE-US-00057 TABLE 57 Number of DMRS CDM DMRS Number of
front-load Value group(s) without data port(s) symbols 0 3 0, 1, 4,
5 1 1 2 0, 1, 6, 7 2 2 3 4, 5, 10, 11 2 3 3 0, 1, 4, 5 2 4 3 0, 1,
6, 7 2 5-15 Reserved Reserved Reserved
[0129] The DMRS group configuration for Table 58 is: transform
precoder is disabled; dmrs-Type=2; maxLength=2; and rank=4.
TABLE-US-00058 TABLE 58 Number of DMRS CDM DMRS Number of
front-load Value group(s) without data port(s) symbols 0 3 2, 3, 4,
5 1 1 2 2, 3, 8, 9 2 2 3 4, 5, 10, 11 2 3 3 2, 3, 4, 5 2 4 3 2, 3,
8, 9 2 5-15 Reserved Reserved Reserved
[0130] The DMRS group configuration for Table 59 is: dmrs-Type=1;
and maxLength=1.
TABLE-US-00059 TABLE 59 Number of DMRS CDM DMRS Value group(s)
without data port(s) 0 2 0 1 2 1 2 2 0, 1 3 Reserved Reserved
[0131] The DMRS group configuration for Table 60 is: dmrs-Type=1;
and maxLength=1.
TABLE-US-00060 TABLE 60 Number of DMRS CDM DMRS Value group(s)
without data port(s) 0 2 2 1 2 3 2 2 2, 3 3 Reserved Reserved
[0132] The DMRS group configuration for Table 61 is: dmrs-Type=1;
and maxLength=2.
TABLE-US-00061 TABLE 61 Number of DMRS CDM DMRS Number of front-
Value group(s) without data port(s) load symbols 0 2 0 1 1 2 1 1 2
2 0, 1 1 3 2 0 2 4 2 1 2 5 2 4 2 6 2 5 2 7 2 0, 1 2 8 2 4, 5 2 9 2
0, 4 2 10 2 0, 1, 4 2 11 2 0, 1, 4, 5 2 12-15 Reserved Reserved
Reserved
[0133] The DMRS group configuration for Table 62 is: dmrs-Type=1;
and maxLength=2.
TABLE-US-00062 TABLE 62 Number of DMRS CDM DMRS Number of
front-load Value group(s) without data port(s) symbols 0 2 2 1 1 2
3 1 2 2 2, 3 1 3 2 2 2 4 2 3 2 5 2 6 2 6 2 7 2 7 2 2, 3 2 8 2 6, 7
2 9 2 2, 6 2 10 2 2, 3, 6 2 11 2 2, 3, 6, 7 2 12-15 Reserved
Reserved Reserved
[0134] The DMRS group configuration for Table 63 is: dmrs-Type=2;
and maxLength=1.
TABLE-US-00063 TABLE 63 Number of DMRS CDM DMRS Value group(s)
without data port(s) 0 2 0 1 2 1 2 2 0, 1 3 3 4 4 3 5 5 3 0 6 3 1 7
3 0, 1 8 3 0, 4 9 3 4, 5 10 3 0, 1, 4 11 3 0, 1, 4, 5 12-15
Reserved Reserved
[0135] The DMRS group configuration for Table 64 is: dmrs-Type=2;
and maxLength=1.
TABLE-US-00064 TABLE 64 Number of DMRS CDM DMRS Value group(s)
without data port(s) 0 2 2 1 2 3 2 2 2, 3 3 3 4 4 3 5 5 3 2 6 3 3 7
3 2, 3 8 3 2, 4 9 3 4, 5 10 3 2, 3, 4 11 3 2, 3, 4, 5 12-15
Reserved Reserved
[0136] The DMRS group configuration for Table 65 is: dmrs-Type=2;
and maxLength=2.
TABLE-US-00065 TABLE 65 Number of DMRS CDM DMRS Number of
front-load Value group(s) without data port(s) symbols 0 2 0 1 1 2
1 1 2 2 0, 1 1 3 3 0 1 4 3 1 1 5 3 4 1 6 3 5 1 7 3 0, 1 1 8 3 4, 5
1 9 3 0, 4 1 10 3 0, 1, 4 1 11 3 0, 1, 4, 5 1 12 3 0 2 13 3 1 2 14
3 4 2 15 3 5 2 16 3 6 2 17 3 7 2 18 3 10 2 19 3 11 2 20 3 0, 1 2 21
3 4, 5 2 22 3 6, 7 2 23 3 10, 11 2 24 3 4, 5, 10 2 25 3 0, 1, 6 2
26 3 0, 1, 6, 7 2 27 3 4, 5, 10, 11 2 28 2 0, 1 2 29 2 6, 7 2 30-31
Reserved Reserved Reserved
[0137] The DMRS group configuration for Table 66 is: dmrs-Type=2;
and maxLength=2.
TABLE-US-00066 TABLE 66 Number of DMRS CDM DMRS Number of
front-load Value group(s) without data port(s) symbols 0 2 2 1 1 2
3 1 2 2 2, 3 1 3 3 4 1 4 3 5 1 5 3 2 1 6 3 3 1 7 3 2, 3 1 8 3 2, 4
1 9 3 4, 5 1 10 3 2, 3, 4 1 11 3 2, 3, 4, 5 1 12 3 2 2 13 3 3 2 14
3 4 2 15 3 5 2 16 3 8 2 17 3 9 2 18 3 10 2 19 3 11 2 20 3 2, 3 2 21
3 4, 5 2 22 3 8, 9 2 23 3 10, 11 2 24 3 4, 5, 10 2 25 3 2, 3, 8 2
26 3 2, 3, 8, 9 2 27 3 4, 5, 10, 11 2 28 2 2, 3 2 29 2 8, 9 2 30-31
Reserved Reserved Reserved
[0138] FIG. 5 is a schematic flow chart diagram illustrating one
embodiment of a method 500 for indicating DMRS ports for codewords.
In some embodiments, the method 500 is performed by an apparatus,
such as the network unit 104. In certain embodiments, the method
500 may be performed by a processor executing program code, for
example, a microcontroller, a microprocessor, a CPU, a GPU, an
auxiliary processing unit, a FPGA, or the like.
[0139] The method 500 may include transmitting 502 downlink control
information. In such an embodiment, the downlink control
information includes first information used to indicate a plurality
of demodulation reference signal ports for transmitting a plurality
of codewords, receiving the plurality of codewords, or a
combination thereof. In certain embodiments, the method 500
includes transmitting 504 second information indicating a plurality
of reference signals for transmitting the plurality of codewords,
receiving the plurality of codewords, or a combination thereof.
[0140] In certain embodiments, the first information indicates an
entry in a table corresponding to a plurality of antenna ports. In
some embodiments, the table is selected from a plurality of tables
based on a demodulation reference signal configuration, a
transmission rank, or a combination thereof. In various
embodiments, the entry in the table is selected based on a
demodulation reference signal group configuration, a transmission
rank of each codeword, or a combination thereof.
[0141] In one embodiment, a demodulation reference signal group of
a plurality of demodulation reference signal groups indicated by
the demodulation reference signal group configuration comprises at
least one code division multiplexed group of a plurality of code
division multiplexed groups. In certain embodiments, each code
division multiplexed group of the plurality of code division
multiplexed groups corresponds to one demodulation reference signal
group of a plurality of demodulation reference signal groups.
[0142] In some embodiments, the downlink control information
comprises at least one bit used to indicate whether a third code
division multiplexed group of the plurality of code division
multiplexed groups is assigned to a first demodulation reference
signal group of the plurality of demodulation reference signal
groups, a second demodulation reference signal group of the
plurality of demodulation reference signal groups, no demodulation
reference signal group of the plurality of demodulation reference
signal groups, or some combination thereof.
[0143] In various embodiments, a first code division multiplexed
group of the plurality of code division multiplexed groups is
assigned to the first demodulation reference signal group, and a
second code division multiplexed group of the plurality of code
division multiplexed groups is assigned to the second demodulation
reference signal group. In one embodiment, a demodulation reference
signal group indicated by the demodulation reference signal group
configuration comprises a set of demodulation reference signal
ports of the plurality of demodulation reference signal ports, and
each demodulation reference signal port of the set of demodulation
reference signal ports is quasi co-located with other demodulation
reference signal ports of the set of demodulation reference signal
ports.
[0144] In certain embodiments, a demodulation reference signal
group indicated by the demodulation reference signal group
configuration corresponds to one transmission reception point of a
plurality of transmission reception points, one panel of a
plurality of panels, or a combination thereof. In some embodiments,
the one panel comprises a panel identifier. In various embodiments,
the panel identifier is used as a demodulation reference signal
group identifier.
[0145] In one embodiment, a demodulation reference signal group
identifier is associated with a panel identifier by higher layer
parameters. In certain embodiments, the second information is
indicated by a plurality of sounding reference signal resource
indicators or transmission configuration indicator states. In some
embodiments, each sounding reference signal resource indicator of
the plurality of sounding reference signal resource indicators
comprises at least one reference signal of the plurality of
reference signals, and a target demodulation reference signal is
transmitted with a spatial domain transmission filter indicated by
a corresponding sounding reference signal resource indicator.
[0146] In various embodiments, each transmission configuration
indicator state of the plurality of transmission configuration
indicator states comprises a least one reference signal of the
plurality of reference signals, and the at least one reference
signal is quasi co-located with one demodulation reference signal
group for downlink reception.
[0147] FIG. 6 is a schematic flow chart diagram illustrating
another embodiment of a method 600 for receiving information
indicating DMRS ports for codewords. In some embodiments, the
method 600 is performed by an apparatus, such as the remote unit
102. In certain embodiments, the method 600 may be performed by a
processor executing program code, for example, a microcontroller, a
microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA,
or the like.
[0148] The method 600 may include receiving 602 downlink control
information. In such an embodiment, the downlink control
information includes first information used to indicate a plurality
of demodulation reference signal ports for transmitting a plurality
of codewords, receiving the plurality of codewords, or a
combination thereof. In certain embodiments, the method 600
includes determining 604 a set of demodulation reference signal
ports of the plurality of demodulation reference signal ports for
each codeword of the plurality of codewords based on a demodulation
reference signal group configuration. In some embodiments, the
method 600 includes receiving 606 second information indicating a
plurality of reference signals for transmitting the plurality of
codewords, receiving the plurality of codewords, or a combination
thereof.
[0149] In certain embodiments, the first information indicates an
entry in a table corresponding to a plurality of antenna ports. In
some embodiments, the table is selected from a plurality of tables
based on a demodulation reference signal configuration, a
transmission rank, or a combination thereof. In various
embodiments, the entry in the table is selected based on the
demodulation reference signal group configuration, a transmission
rank of each codeword, or a combination thereof.
[0150] In one embodiment, a demodulation reference signal group of
a plurality of demodulation reference signal groups indicated by
the demodulation reference signal group configuration comprises at
least one code division multiplexed group of a plurality of code
division multiplexed groups. In certain embodiments, each code
division multiplexed group of the plurality of code division
multiplexed groups corresponds to one demodulation reference signal
group of a plurality of demodulation reference signal groups.
[0151] In some embodiments, the downlink control information
comprises at least one bit used to indicate whether a third code
division multiplexed group of the plurality of code division
multiplexed groups is assigned to a first demodulation reference
signal group of the plurality of demodulation reference signal
groups, a second demodulation reference signal group of the
plurality of demodulation reference signal groups, no demodulation
reference signal group of the plurality of demodulation reference
signal groups, or some combination thereof.
[0152] In various embodiments, a first code division multiplexed
group of the plurality of code division multiplexed groups is
assigned to the first demodulation reference signal group, and a
second code division multiplexed group of the plurality of code
division multiplexed groups is assigned to the second demodulation
reference signal group. In one embodiment, a demodulation reference
signal group indicated by the demodulation reference signal group
configuration comprises a set of demodulation reference signal
ports of the plurality of demodulation reference signal ports, and
each demodulation reference signal port of the set of demodulation
reference signal ports is quasi co-located with other demodulation
reference signal ports of the set of demodulation reference signal
ports.
[0153] In certain embodiments, a demodulation reference signal
group indicated by the demodulation reference signal group
configuration corresponds to one transmission reception point of a
plurality of transmission reception points, one panel of a
plurality of panels, or a combination thereof. In some embodiments,
the one panel comprises a panel identifier. In various embodiments,
the panel identifier is used as a demodulation reference signal
group identifier.
[0154] In one embodiment, a demodulation reference signal group
identifier is associated with a panel identifier by higher layer
parameters. In certain embodiments, the second information is
indicated by a plurality of sounding reference signal resource
indicators or transmission configuration indicator states. In some
embodiments, each sounding reference signal resource indicator of
the plurality of sounding reference signal resource indicators
comprises at least one reference signal of the plurality of
reference signals, and a target demodulation reference signal is
transmitted with a spatial domain transmission filter indicated by
a corresponding sounding reference signal resource indicator.
[0155] In various embodiments, each transmission configuration
indicator state of the plurality of transmission configuration
indicator states comprises a least one reference signal of the
plurality of reference signals, and the at least one reference
signal is quasi co-located with one demodulation reference signal
group for downlink reception.
[0156] In one embodiment, a method comprises: transmitting downlink
control information, wherein the downlink control information
comprises first information used to indicate a plurality of
demodulation reference signal ports for transmitting a plurality of
codewords, receiving the plurality of codewords, or a combination
thereof; and transmitting second information indicating a plurality
of reference signals for transmitting the plurality of codewords,
receiving the plurality of codewords, or a combination thereof.
[0157] In certain embodiments, the first information indicates an
entry in a table corresponding to a plurality of antenna ports.
[0158] In some embodiments, the table is selected from a plurality
of tables based on a demodulation reference signal configuration, a
transmission rank, or a combination thereof.
[0159] In various embodiments, the entry in the table is selected
based on a demodulation reference signal group configuration, a
transmission rank of each codeword, or a combination thereof.
[0160] In one embodiment, a demodulation reference signal group of
a plurality of demodulation reference signal groups indicated by
the demodulation reference signal group configuration comprises at
least one code division multiplexed group of a plurality of code
division multiplexed groups.
[0161] In certain embodiments, each code division multiplexed group
of the plurality of code division multiplexed groups corresponds to
one demodulation reference signal group of a plurality of
demodulation reference signal groups.
[0162] In some embodiments, the downlink control information
comprises at least one bit used to indicate whether a third code
division multiplexed group of the plurality of code division
multiplexed groups is assigned to a first demodulation reference
signal group of the plurality of demodulation reference signal
groups, a second demodulation reference signal group of the
plurality of demodulation reference signal groups, no demodulation
reference signal group of the plurality of demodulation reference
signal groups, or some combination thereof.
[0163] In various embodiments, a first code division multiplexed
group of the plurality of code division multiplexed groups is
assigned to the first demodulation reference signal group, and a
second code division multiplexed group of the plurality of code
division multiplexed groups is assigned to the second demodulation
reference signal group.
[0164] In one embodiment, a demodulation reference signal group
indicated by the demodulation reference signal group configuration
comprises a set of demodulation reference signal ports of the
plurality of demodulation reference signal ports, and each
demodulation reference signal port of the set of demodulation
reference signal ports is quasi co-located with other demodulation
reference signal ports of the set of demodulation reference signal
ports.
[0165] In certain embodiments, a demodulation reference signal
group indicated by the demodulation reference signal group
configuration corresponds to one transmission reception point of a
plurality of transmission reception points, one panel of a
plurality of panels, or a combination thereof.
[0166] In some embodiments, the one panel comprises a panel
identifier.
[0167] In various embodiments, the panel identifier is used as a
demodulation reference signal group identifier.
[0168] In one embodiment, a demodulation reference signal group
identifier is associated with a panel identifier by higher layer
parameters.
[0169] In certain embodiments, the second information is indicated
by a plurality of sounding reference signal resource indicators or
transmission configuration indicator states.
[0170] In some embodiments, each sounding reference signal resource
indicator of the plurality of sounding reference signal resource
indicators comprises at least one reference signal of the plurality
of reference signals, and a target demodulation reference signal is
transmitted with a spatial domain transmission filter indicated by
a corresponding sounding reference signal resource indicator.
[0171] In various embodiments, each transmission configuration
indicator state of the plurality of transmission configuration
indicator states comprises a least one reference signal of the
plurality of reference signals, and the at least one reference
signal is quasi co-located with one demodulation reference signal
group for downlink reception.
[0172] In one embodiment, an apparatus comprises: a transmitter
that: transmits downlink control information, wherein the downlink
control information comprises first information used to indicate a
plurality of demodulation reference signal ports for transmitting a
plurality of codewords, receiving the plurality of codewords, or a
combination thereof; and transmits second information indicating a
plurality of reference signals for transmitting the plurality of
codewords, receiving the plurality of codewords, or a combination
thereof.
[0173] In certain embodiments, the first information indicates an
entry in a table corresponding to a plurality of antenna ports.
[0174] In some embodiments, the table is selected from a plurality
of tables based on a demodulation reference signal configuration, a
transmission rank, or a combination thereof.
[0175] In various embodiments, the entry in the table is selected
based on a demodulation reference signal group configuration, a
transmission rank of each codeword, or a combination thereof.
[0176] In one embodiment, a demodulation reference signal group of
a plurality of demodulation reference signal groups indicated by
the demodulation reference signal group configuration comprises at
least one code division multiplexed group of a plurality of code
division multiplexed groups.
[0177] In certain embodiments, each code division multiplexed group
of the plurality of code division multiplexed groups corresponds to
one demodulation reference signal group of a plurality of
demodulation reference signal groups.
[0178] In some embodiments, the downlink control information
comprises at least one bit used to indicate whether a third code
division multiplexed group of the plurality of code division
multiplexed groups is assigned to a first demodulation reference
signal group of the plurality of demodulation reference signal
groups, a second demodulation reference signal group of the
plurality of demodulation reference signal groups, no demodulation
reference signal group of the plurality of demodulation reference
signal groups, or some combination thereof.
[0179] In various embodiments, a first code division multiplexed
group of the plurality of code division multiplexed groups is
assigned to the first demodulation reference signal group, and a
second code division multiplexed group of the plurality of code
division multiplexed groups is assigned to the second demodulation
reference signal group.
[0180] In one embodiment, a demodulation reference signal group
indicated by the demodulation reference signal group configuration
comprises a set of demodulation reference signal ports of the
plurality of demodulation reference signal ports, and each
demodulation reference signal port of the set of demodulation
reference signal ports is quasi co-located with other demodulation
reference signal ports of the set of demodulation reference signal
ports.
[0181] In certain embodiments, a demodulation reference signal
group indicated by the demodulation reference signal group
configuration corresponds to one transmission reception point of a
plurality of transmission reception points, one panel of a
plurality of panels, or a combination thereof.
[0182] In some embodiments, the one panel comprises a panel
identifier.
[0183] In various embodiments, the panel identifier is used as a
demodulation reference signal group identifier.
[0184] In one embodiment, a demodulation reference signal group
identifier is associated with a panel identifier by higher layer
parameters.
[0185] In certain embodiments, the second information is indicated
by a plurality of sounding reference signal resource indicators or
transmission configuration indicator states.
[0186] In some embodiments, each sounding reference signal resource
indicator of the plurality of sounding reference signal resource
indicators comprises at least one reference signal of the plurality
of reference signals, and a target demodulation reference signal is
transmitted with a spatial domain transmission filter indicated by
a corresponding sounding reference signal resource indicator.
[0187] In various embodiments, each transmission configuration
indicator state of the plurality of transmission configuration
indicator states comprises a least one reference signal of the
plurality of reference signals, and the at least one reference
signal is quasi co-located with one demodulation reference signal
group for downlink reception.
[0188] In one embodiment, a method comprises: receiving downlink
control information, wherein the downlink control information
comprises first information used to indicate a plurality of
demodulation reference signal ports for transmitting a plurality of
codewords, receiving the plurality of codewords, or a combination
thereof; determining a set of demodulation reference signal ports
of the plurality of demodulation reference signal ports for each
codeword of the plurality of codewords based on a demodulation
reference signal group configuration; and receiving second
information indicating a plurality of reference signals for
transmitting the plurality of codewords, receiving the plurality of
codewords, or a combination thereof.
[0189] In certain embodiments, the first information indicates an
entry in a table corresponding to a plurality of antenna ports.
[0190] In some embodiments, the table is selected from a plurality
of tables based on a demodulation reference signal configuration, a
transmission rank, or a combination thereof.
[0191] In various embodiments, the entry in the table is selected
based on the demodulation reference signal group configuration, a
transmission rank of each codeword, or a combination thereof.
[0192] In one embodiment, a demodulation reference signal group of
a plurality of demodulation reference signal groups indicated by
the demodulation reference signal group configuration comprises at
least one code division multiplexed group of a plurality of code
division multiplexed groups.
[0193] In certain embodiments, each code division multiplexed group
of the plurality of code division multiplexed groups corresponds to
one demodulation reference signal group of a plurality of
demodulation reference signal groups.
[0194] In some embodiments, the downlink control information
comprises at least one bit used to indicate whether a third code
division multiplexed group of the plurality of code division
multiplexed groups is assigned to a first demodulation reference
signal group of the plurality of demodulation reference signal
groups, a second demodulation reference signal group of the
plurality of demodulation reference signal groups, no demodulation
reference signal group of the plurality of demodulation reference
signal groups, or some combination thereof.
[0195] In various embodiments, a first code division multiplexed
group of the plurality of code division multiplexed groups is
assigned to the first demodulation reference signal group, and a
second code division multiplexed group of the plurality of code
division multiplexed groups is assigned to the second demodulation
reference signal group.
[0196] In one embodiment, a demodulation reference signal group
indicated by the demodulation reference signal group configuration
comprises a set of demodulation reference signal ports of the
plurality of demodulation reference signal ports, and each
demodulation reference signal port of the set of demodulation
reference signal ports is quasi co-located with other demodulation
reference signal ports of the set of demodulation reference signal
ports.
[0197] In certain embodiments, a demodulation reference signal
group indicated by the demodulation reference signal group
configuration corresponds to one transmission reception point of a
plurality of transmission reception points, one panel of a
plurality of panels, or a combination thereof.
[0198] In some embodiments, the one panel comprises a panel
identifier.
[0199] In various embodiments, the panel identifier is used as a
demodulation reference signal group identifier.
[0200] In one embodiment, a demodulation reference signal group
identifier is associated with a panel identifier by higher layer
parameters.
[0201] In certain embodiments, the second information is indicated
by a plurality of sounding reference signal resource indicators or
transmission configuration indicator states.
[0202] In some embodiments, each sounding reference signal resource
indicator of the plurality of sounding reference signal resource
indicators comprises at least one reference signal of the plurality
of reference signals, and a target demodulation reference signal is
transmitted with a spatial domain transmission filter indicated by
a corresponding sounding reference signal resource indicator.
[0203] In various embodiments, each transmission configuration
indicator state of the plurality of transmission configuration
indicator states comprises a least one reference signal of the
plurality of reference signals, and the at least one reference
signal is quasi co-located with one demodulation reference signal
group for downlink reception.
[0204] In one embodiment, an apparatus comprises: a receiver that
receives downlink control information, wherein the downlink control
information comprises first information used to indicate a
plurality of demodulation reference signal ports for transmitting a
plurality of codewords, receiving the plurality of codewords, or a
combination thereof; and a processor that determines a set of
demodulation reference signal ports of the plurality of
demodulation reference signal ports for each codeword of the
plurality of codewords based on a demodulation reference signal
group configuration; wherein the receiver receives second
information indicating a plurality of reference signals for
transmitting the plurality of codewords, receiving the plurality of
codewords, or a combination thereof.
[0205] In certain embodiments, the first information indicates an
entry in a table corresponding to a plurality of antenna ports.
[0206] In some embodiments, the table is selected from a plurality
of tables based on a demodulation reference signal configuration, a
transmission rank, or a combination thereof.
[0207] In various embodiments, the entry in the table is selected
based on the demodulation reference signal group configuration, a
transmission rank of each codeword, or a combination thereof.
[0208] In one embodiment, a demodulation reference signal group of
a plurality of demodulation reference signal groups indicated by
the demodulation reference signal group configuration comprises at
least one code division multiplexed group of a plurality of code
division multiplexed groups.
[0209] In certain embodiments, each code division multiplexed group
of the plurality of code division multiplexed groups corresponds to
one demodulation reference signal group of a plurality of
demodulation reference signal groups.
[0210] In some embodiments, the downlink control information
comprises at least one bit used to indicate whether a third code
division multiplexed group of the plurality of code division
multiplexed groups is assigned to a first demodulation reference
signal group of the plurality of demodulation reference signal
groups, a second demodulation reference signal group of the
plurality of demodulation reference signal groups, no demodulation
reference signal group of the plurality of demodulation reference
signal groups, or some combination thereof.
[0211] In various embodiments, a first code division multiplexed
group of the plurality of code division multiplexed groups is
assigned to the first demodulation reference signal group, and a
second code division multiplexed group of the plurality of code
division multiplexed groups is assigned to the second demodulation
reference signal group.
[0212] In one embodiment, a demodulation reference signal group
indicated by the demodulation reference signal group configuration
comprises a set of demodulation reference signal ports of the
plurality of demodulation reference signal ports, and each
demodulation reference signal port of the set of demodulation
reference signal ports is quasi co-located with other demodulation
reference signal ports of the set of demodulation reference signal
ports.
[0213] In certain embodiments, a demodulation reference signal
group indicated by the demodulation reference signal group
configuration corresponds to one transmission reception point of a
plurality of transmission reception points, one panel of a
plurality of panels, or a combination thereof.
[0214] In some embodiments, the one panel comprises a panel
identifier.
[0215] In various embodiments, the panel identifier is used as a
demodulation reference signal group identifier.
[0216] In one embodiment, a demodulation reference signal group
identifier is associated with a panel identifier by higher layer
parameters.
[0217] In certain embodiments, the second information is indicated
by a plurality of sounding reference signal resource indicators or
transmission configuration indicator states.
[0218] In some embodiments, each sounding reference signal resource
indicator of the plurality of sounding reference signal resource
indicators comprises at least one reference signal of the plurality
of reference signals, and a target demodulation reference signal is
transmitted with a spatial domain transmission filter indicated by
a corresponding sounding reference signal resource indicator.
[0219] In various embodiments, each transmission configuration
indicator state of the plurality of transmission configuration
indicator states comprises a least one reference signal of the
plurality of reference signals, and the at least one reference
signal is quasi co-located with one demodulation reference signal
group for downlink reception.
[0220] Embodiments may be practiced in other specific forms. The
described embodiments are to be considered in all respects only as
illustrative and not restrictive. The scope of the invention is,
therefore, indicated by the appended claims rather than by the
foregoing description. All changes which come within the meaning
and range of equivalency of the claims are to be embraced within
their scope.
* * * * *